I'm sorry to say that that is a homemade hide made of styrofoam pieces that were cut to shape, glued together, covered in grout or another non-toxic sealant, and then sealed and painted as desired. You wont be able to buy that one, but I'm sure there are people who could custom make one for you (with a price of course), or you could make one at home yourself There are a lot of videos on youtube that have instructions on how to build these.
Welcome to the forum, and I hope that we can answer any other questions you might have
I agree that it looks like someone custom made it for their geckos. There are a lot of cool ones on ebay if you search around! Not sure what they're all made with or how safe all of them are but I bet the seller would let you know what they used if you ask!