[Renew] Backing up GB/GBA saves

Hey there,
to be honest I just joined the scene this year and after digging through quite recent and older threads, I wasn't able to come to a conclusion.
I'm looking for a device/software-solution to back up my save games from original cartridges - for emulator (PSP/PC) and Everdrive-use.
The conditions are the following:
- Ideal price under 50-75 dollar/euro
- Works with Windows 7 or higher
- Works with (nearly) every GB/GBC/GBA cartridge
- Can backup saves and is capable of kicking 'em back to the cartridge

Solutions I found:
- Mega Memory with USB Smart Card -> Quite expensive
- Retrode -> Is reported as not reliable on all GB(/C/A) cartridges
- Smartboy -> Should work, stock unknown
- Transferer 2 -> Compatibility to newer GBA cartridges not clearly determined (SRAM/EEPROM); Unknown if working with USB-Adapter under Win7/10

Can you help me out with your experience?

Edit:
Another possible solution I found:
Would it be possible to transfer the saves from an original cartridge to the Everdrive, via a Transferer Machine (here) and thus from the Everdrive to a PC?

Regards
[Keksdose]

 

BennVenn's reader/writer is the item to get. Check the site for a re-stock announcement.

http://bennvenn.myshopify.com

 

Looks really good.
Did I get the functionality right? It can read out saves/roms from the cartridges and write them back to writable ones. The only other device I could possibly need would be an empty cartridge to get all my games in one place.