I bought the first one I ran across. I dont know how much they go for anywhere else but mine is pretty nice and very durable. Ive only used it for a few years now but my little gun and I have been through hell and back haha. Even if they can be found cheaper, I still recommend the hope depot brand.

Im gonna go out on a limb here and say that I do not beleive it is an urban myth with the belly heat. Snakes intentionally go on rocks that have been heated by the sun, or warm earth while basking, and I beleive that to be for the belly warmpth to aid digestion. If the temperature alone is what was desired they would go to a safer spot than an open rock under the sun. I dont have any evidence, but Ill choose to continue beleiving it.