Do you know a website of Bigfoot related casts for sale?
Not to my knowledge. I assume that you are looking for foot casts? Most if not all are fake. Is there such a creature? I don't know. While new species are found regularly on expeditions, finding a large mammal such as Sasquatch would be most unlikely. We've not found other kinds of evidence such as kills, bones or other remains or even hair that has been unquestionably been IDed as being from a new species. However as an Anthropologist and knowing the history of the folk lore, I will not say that they don't exist.