You might have run across Skin Video before but you should take a second look.  They have updated their system whereas before they mostly just had free newsgroup stuff.  Now they have lots and lots of videos including some really good amateur stuff.  Their pricing is among the best around at only $2.95 for a three day trial.  Their monthly cost is an unheard of $14.95 and they will even give you a further discount if you sign up for 3 months!