"Had for a deal" is relative, and totally dependent on your budget and circumstances. You need to know what you want and put yourself at the coner of Wanna Buy and Wanna Sell. With cash in hand.

If you're looking for a sub-$200 frameset in good condition, then a Cannondale, older Trek, or Schwinn Tempo/Super Sport from the late 80's should be in your future.

On the other hand, an $800 Merckx MXL in fine condition would be considered cheap by many collectors.

So, there's that.

And, as others have mentioned, good frames (or information about where one is located) are often found on this site every day.