Where to buy all pokemon games and micro gba?

So schools almost over for 9th grade, and starting 10th I took a study hall elective class and I just need something to do to past the 2 hours, I think, its a and b schedule days, anyways, I want to know where to buy the Micro boy advance thing, and is it any good to just hide and play? cause I have the iPhone 4 and downloaded the emu's, but its not the same, I have gold, fire red, ruby, diamond, heart gold and black, I know it sounds childish, but it just brings back memories aha, so I just want to know where to get Yellow version, crystal version, and the micro boy advance thing, but not something way too pricey, cause i'm saving for a car and a mac book pro, anyways thanks a ton.