Portable sink for outdoor food party

I stumbled upon a great, portable sink at the mall the other day. Anyone else use these things? They’re super convenient for when you’re getting ready to host an outdoor food gathering. There’s one out there that I know of. I’ve used it once before, and it had saved me during a poor circumstance where I’d forgotten to clean all my dishes upon our last family reunion trip. Does anyone know how much they go for? I’d really like to get one next time - after all, such markets have really increased in popularity nowadays.