Good luck with that...
Really, its hard to find decent speakers for any price right now, IMO. Are you looking for good sound quality, lots of bass, lots of volume or some combination?
If you're looking for good sound quality and decent (but not excessive volume), may I recommend the M-Audio AV 30s, currently on sale from Best Buy for $89.99. A bit over your budget, but well worth it. I have the AV 40s and they're GREAT. The 30s are similar, but with a 3" woofer instead of a 4". They're "studio monitors" (i.e., professional grade) and have a great, even sound to them. But if you're looking for tons of bass, look elsewhere. They're quite respectable for the size, but not booming.
Otherwise, as I said above, good luck...
Oh yeah, if you like bass and volume most, I have a set of older Logitech X220s that will rock your socks (for PC speakers). If you can find a used set on eBay, they're nice, if you like bass (like my wife does).