[xeroinfinity]

Most stock stereos are big, so I'd think most of the 93-95 Grand Ams would work. THe plugs on the back may be different, but I'm pretty damn sure you can buy plug adapters at you local Best Buy or any of those places that sell and install stereos.
But I think $100-150 is way to much for anything out of a junk yard, check around though, theirs tons on GM cars out there and I'm positive several will work for your GA.