I picked up a bike not to long ago myself . .
Got lucky on it, found a used Raleigh for about 100 dollars. I believe its an SC30, not sure about that though.
I was looking for a used bike around that price range, but I also needed one big enough for me (i'm six and a half feet tall).
I walked into a bike shop and they had just gotten the raleigh in earlier that morning, and it was a 22" fram which (they told me) was the largest I'd find without going custom.
It rides well, I just needed a beater to get around houston a bit (I'm a rice freshman). And sure enough, its the largest frame on any rack I park it on. I'm happy with it.