This appears to be one.
https://www.amazon.com/Samsung-Tab-1...cUvbUpU5303340
eBay appeared to have a few. It's becoming increasingly difficult for brick and mortar locations to stock accessories like that because of the range of makes/models out there. It's VERY difficult to satisfy every need, and rather than stock items for a few models, it would be easier to just say "we don't have it". They may stock accessories for devices they actually sell (apparently didn't in your situation, or it was out of stock) but beyond that is hit and miss.