What's your rear spacing? What kind of drivetrain do you have? Are you more concerned about strength, or weight? What kind of riding are you going to do on them? I run a couple of older steel frames with 126mm rear spacing and threaded freewheels, and I just picked up these from a vendor in Illinois called Velomine for about $125 shipped. (if you buy from them direct, you can save about 10% compared to their ebay prices):

Sun M13 Black Road Bike Wheels 126mm Vintage Bike Wheelset 5 6 7 Speed Freewheel | eBay

Wheelsets Velomine.com : Worldwide Bicycle Shop, fixed gear track bike wheelsets campagnolo super record vintage bike

Depending upon what you are looking for and the answers to those questions, they have lots of good wheel sets ranging from just over $100, up to about $300 or more