Wheel & Sprocket has some good deals on wheelsets, in several different flavors:
http://wheelandsprocket.com/page.cfm?pageId=524

I've heard that the IRO wheels are decent, though I've never used them myself...
http://www.irofixedgear.com/index.as...PROD&ProdID=45

I'd say that you're gonna have a tough time finding anything decent for under $150...though someone will probably dispute that. Good luck.