$15-$35?
KSC75, even though it's not closed. You'll need to fiddle with the fit (the wire clip can take a good bit of fiddling abuse! Don't be afraid to bend it for a tight fit!), but the only other around that price that might be good are the AKG 24P. For the price, nothing comes close to the KSC75 (and oh, they amp so well, too).
BTW, noise cancelling is not covering the ear--that would be closed headphones.
Linky
Buy a CD or bookyou've been meaning to get for awhile and you've got free shipping, too.
For more, search OT for "ksc 50" or "ksc 75"
(KSC50 = precursor to KSC75, with the same driver and similar fit)