I got very lucky once. I found a brand new blue N64 controller for £9.99 and free shipping. I bought it immediately. I do think that the seller just didn't know the actual value of the item, because he could have sold it for 3-4 times more money.
I got lucky from an Amazon mistake, well my friend did, but I saw the benefit. It was about 3-4 years ago when SSD's were still very expensive. My mate found an Amazon listing for a brand new Samsung OCZ Agility 120GB SSD for £20. (The price should have been around £120, maybe more) He didn't have much money at the time and didn't really believe that the sale would go through anyway, he thought that they would notice the mistake and refund him, but he bought 2 of them anyway. He sent me a message and if I had noticed it earlier I would have bought a load of them. By the time I noticed the message an hour or so later, the listing had been removed. My mate was still expecting to be told that it was a mistake and have his money refunded, but 2 days later they were delivered to his house. My mate didn't actually want the SSD's, he just wanted a bargain. So he sold me one of them for £30 and sold the other to his online gaming buddy for £60.
i once ordered a n64 off of ebay and when i got it it came with 10 n64 games and i got the games for free
I have scored a few times off of eBay and Amazon. I've got a: Sealed WWF King of the Ring for Gameboy at $12 shipped. Alternate box Zombies Ate My Neighbors CIB for $65 Playchoice 10 TMNT which turned out to be a legit TMNT 2 for Playchoice NES Bonk's Adventure cart for $40
Net Yaroze only came in black. You got a Devstation. Regardless its a pretty good buy. Grats In my stroke of luck I was on shopgoodwill (online goodwill auctioning. Who knew.) and got a Xenon Demo 360. Snagged it for 100USD and when it arrived it not only had the box and foam (was missing av cables though) but once powered and booted it began reading a disc. I checked the drive and found this in it (which has been ripped and sent to borman). Spoiler: Image
eBay? No. But I did score a prototype XBox Alamo controller for $5 when they're worth at least $200. Another day at the same thrift store I found a prototype XBox. Nothing too thrilling, it had a 1.6 mobo with the guts from a 1.4/1.5 XBox. Might have had a beta dash but someone decided to softmod it so that was lost. BIOS could be a beta build but I've never checked.
I got unlucky on ebay recently... Someone had a supergrafx with turbo everdrive listed for £115 buy it now with free postage. I had a code for 10% off electronics over 100 so it would have been 103.50 or something. Went to buy it... the mrs had lost her bank card and had it cancelled so paypal would not go through, by the time i had added her new card, which took about 10 mins, someone else had snapped it up! Must have been worth double what the buyer paid grrrr
Hmmm... nothing jumps to mind. I did get a review copy along with a prototype/development/different-from-release copy of Magic: The Gathering: Battlemage (PC version) on ebay for $24.95+shipping BiN. Granted, not many people probably care about such a thing, but I thought it was a decent deal that could have fetched a bit more had the seller run an open auction instead of a BiN. That's pretty darn lucky.
Bought a job lot of PS1 black label promo discs once, £50 for 50. It included Kula World, Tomba 1& 2, Klonoa and a few other expensive titles
I needed a PC case, so I bought a cheap used one on ebay for ~$20, to my surprise it came with a bluray burner installed.
I don't use eBay anymore but I recently had a lucky break on Amazon. There was a listing for $1.98 16GB micro SD cards + adapter, free shipping. I ordered 3 and expected them to be fake. After testing them, I was surprised to see that they were genuine.
Bought a dreamcast game lot that contained Mars Matrix and Gigawing 2, and about 3 other cheapo titles for about $50 BIN. This isn't an ultra extravagant deal and perhaps wasn't even a mistake, but Mars Matrix and Gigawing 2 could each go for $50 by themselves on a good day.
I once bought a "Saga Genesis with adapter" for $40 shipped. It was a Genesis 2, 2 controllers and a 32X. It had some games too, I forget which. Even came with the patch cable and power supplies.
I snagged Jazz Jackrabbit in 2012 for about 5 dollars... good luck not only getting the game with all its inserts and manual for a decent price, but at all since it is VERY uncommon. Not on eBay, but I got insanely lucky on Amazon a couple of times in that regard too, found Tyrian for a similar price range and Commander Keen in Goodbye Galaxy... brand new for 15 dollars.
I got very lucky late last year, bought a boxed GB Micro Famicom edition from a japanese seller on eBay, and the guy had another one (unboxed) listed as well. He mistakenly sent me the unboxed one, and realized a few days after shipping (it was through regular mail so it would take a couple of weeks) - on the same message he said he had already shipped the correct item now (boxed GB Micro) via EMS that same day. He was afraid of getting negative feedback and told me to keep the other GB micro as a gift, I told him I'd send it back but he insisted on me keeping it. Result: Then, besides eBay, I usually get lucky on Amazon... last year I ordered some PC parts as I was building a new rig, and I got sent by mistake a Corsair H80i GT as an extra. And on Black Friday in 2012 I ordered a Logitech G930 wireless headset and a Logitech mouse, and got sent 2 of each by the price of 1. My first lucky mistake though, was way back in 2003-2004, when buying some Gamecube items on the IGN online store (remember that?), also got my order duplicated and charged only once.