Cheaper heat packs?

Maybe this is in the wrong forum, but can anyone find heat packs cheaper than this?
http://www.exadeal.com/shipping_warmers.html

Those are cheaper then most of the ones I've seen. Here's the same ones that are a few bucks less. Only problem is you can only buy then in packs of 1, 10, or 40

http://lllreptile.com/store/catalog/...our-heat-pack/

Those are good ones to use and that price is around going price unless you buy them in bulk. If you go to any shows you could buy them from there and save on shipping.

Check out TSK Supply...

http://www.tsksupply.com/products/40...ng-Warmer.html