I think the easiest thing to do is to make your own.

I like the square boat fenders found at West Marine, with bungees through the holes and around the hull. Not cheap, but easy and will last a long time.

http://www.westmarine.com/webapp/wc...&subdeptNum=10432&classNum=10388

I've made a few sets out of fiberglass and foam, hard to do and lots of work to get them right.

Pool noodles are another easy choice.

Big chunks of outdoor foam works good too, closes cell and used to make boat cushions, can be found at the places that make boat covers and such.