CAN WTB: Contra/Probotector protos, betas, samples, previews, reviews, etc

I'm considering buying I WANT to buy any type of pre-release versions of Contra. I'M WILLING TO PAY MINIMUM $50 FOR REVIEW DISCS/CARTS AND MINIMUM $100 FOR BETA DISCS. CAN DO PROTO TRADES. Some that I'm looking for:

NES/Famicom:
(added October 4)-Contra. Apparently one went on eBay for 5 figures a few years ago. Not necessarily looking to fork over that much, especially not since that item, if it truly existed, most definitely did not sell for that (either a best offer, was taken down or was just up for bragging). But I am 100% serious on this item if the owner decides to turn up.

-Super C prototype. Last owned by JD/Elijah (John David Heins), who had passed away in 2014; was in the state of Iowa. All guesses play even on the fate of this proto. But if another owner now has it, I'd be highly interested in buying it, or at least working something out to get its data preserved.

-Probotector II NTSC-U sample cartridge

Game Boy:
-Any Contra proto

SNES/Super Famicom:
-Contra III beta. Has "Not For Resale" on it, but it's NOT the same as the "Not For resale" carts usually seen. This one is like a lab loaner; plain white label with black print; back has "Return" instructions, with address and comment.

-Contra III review cart, sold by retrogamesuk.

Sega Genesis:
-Probotector beta (used in magazines)

PS2:
(Added October 4)-Contra: Shattered Soldier possible review disc. Apparently has the final version's artwork, almost the same in fact, EXCEPT that the rating is RP instead of T. It was seen at a flea market named 192 Flea Market in Kissimmee, Florida. WILL PAY $200 FOR THIS DISC + FINDER'S FEE BONUS.

Beta Discs Sold by DreamTR back in 2008:
Contra: Legacy of War Pre-Final Preserved!
C: The Contra Adventure V0.8
C: The Contra Adventure (nothing else written, seemingly; maybe review or beta)
Contra: Shattered Soldier E3 Preview
Contra: Shattered Soldier (nothing else written, seemingly; maybe review or beta)
Neo Contra Review Preserved!
$200 EACH, NO JOKE!!!!!!!

-Neo Contra review discs. One was sold by Buyatari to Saint_Eve in 2007 and the other was sold by The_Dreaming_Eye/The_Brown_Eye in 2005; the latter at least was a Q4 disc so it's definitely near-final AFAIK. Not sure if Buyatari's is the same build.

-Contra disc betas sold by @kiff. Were sold to an American collector here. Given how long it has been, I'm sure there's no harm in letting some go!

DS:
-Contra 4 DS proto, traded by retrogamesuk.

Pictures are greatly appreciated... Thanks

WILLING TO THROW IN A PROTO AS PART OF THE PURCHASE

I'm located in Canada, FWIW. But I'm willing to purchase from almost anywhere protos are located.

 

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I see rolling tumbleweeds and a hear cowboy song... ))

 

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Up. Looking for Contra and Probotector series protos.

 

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Massive bump. Especially looking for any disc-based Contra protos.

 

Up. Got any betas, playable previews, review copies, early protos etc. of disc games, greatly interested. Also any cartridge-based Contra/Probotector protos.

 

Back up to the top. Looking for any others.

 

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Up. LOOKING FOR PS1, PS2, SATURN CONTRA PROTOS, BETAS, ETC

 

Still looking... disc protos