Nice collection. When I was still collecting Game Boys, I never could track down the Pokemon versions locally.
Nice! I used to have the color with pikachu and pichu... wish I still had it, Its been a long time, IDR what I did with it.
look for the gold version of the one on the right I have one I bought back in the day because it was ons sale .
http://en.wikipedia.org/wiki/List_of_Game_Boy_colors_and_styles http://www.imgcab.com/gameboy/gameboy0.html
Well, there are some BINs on eBay for a bit more. At auction last year I got one for a tenner and it was mint and complete. I guess that's about $15.. Meh.
The yellow ones are cheap since they were publicly available at Toys R Us, the silver colour and thye gold advance are worth more due to them only being available at the pokemon stores in Tokyo and New York
I remember seeing the gold gameboy advance at my Game Stop back in the day, but my mom wouldn't let me get one since I already had one.