There's a few places that I know of.
www.piddlepads.com www.valethics.com www.pishpad.com
You can also check out this
thread. Someone else said that baby burp rags work well too.
I have the PiddlePads and love them....
Couple tips though.... Don't use fabric softener (any liquids on the pad will just kind of bead up and don't get absorbed) or bleach (it's too harsh on the fabric and shortens the life span). Detergents work better than soaps (think Ivory Snow). Check out
diaperpin.com for more washing tips (they reference baby diapers... same thing more or less). I noticed there was still a slight odor after washing them (I was only using laundry soap), and I followed the tips on the site and they're now scent free! Another YTer uses Odo Ban to get rid of any odors... I haven't tried that yet. The baking soda/vinegar is cheap and it works well....