Also check out Top Contender Thai pads on combatsports.com . I have a pair. They were pretty cheap, and they are pretty durable. I likes 'em.
Don't try to order them off ringsport.com or CSI. They're both back-ordered right now. I think they share an inventory system, judging by their identical email confirmations.
I got them as well off of eBay: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=7211016097 At $69 including shipping, it's a touch better than what you could get at an online store.
Nobody order off of CSI before you ask them when the pads will be in. Their online store doesn't tell you if they're back-ordered or not, which they currently are for their cheapest pair.
I've not ordered his thai pads or tried them but he does have an ebay account as I found his grappling gloves on ebay originally and he sent me onto his KO fight gear home page.Heard good stuff about his gear and good customer service too.
I won a pair in the auction, and they got shipped in a day. wow. They are really stiff, and I look forward to starting breaking them in tomorrow in class.