I'm thinking about making one following the regular PCB layout from the website, but I can't find ferric chloride to etch the PCB layout over here, only on Amazon.co.uk and ebay. Also, did you get the cartridge slot from something like a game genie or an actual Game Boy? That seems the only part that is hard to come by and I don't want to destroy one of my gameboys.
Otherwise, the programmer looks really neat and the price seems decent too, but doing it myself will keep me busy and be a couple bucks cheaper.
Maybe this is obvious to some, but I'm not sure myself so I wanted to ask: can the programmer read the SRAM of other cartridges as well, like a Pokémon game or the Game Boy Camera? If I can do with the programmer what I'm currently accomplishing through a Mega Memory, that alone might interest me in picking one up eventually. I'm not really down for soldering those SMD IC's, though...
I think so, there is an app for the programmer so that you can get photos off your Game Boy Camera and I'm guessing that this would work for other cartridges, although I'm not shure.