i'll assume we're talking about steelies here...
13's aren't really worth anything unless you find somebody running the really early stuff that needs them and even then they're not gonna want to pay anything for them.
14's are a little better because there's still people out there running around on them, but nobody want to pay dick for 'em. i can generally sell those for about 20~25 a clip. supposedly the 5.5" ones are sought after.
at a recent swap i didn't sell the bare 5.5's i had or the standards with brand new tires. so i guess price them accordingly?