Don’t work there but an experience I had once. I wanted a few assassin snails and the guy took literally 20 minutes to get them trying to fish them out. I watched him check them so figured all 5 were occupied and alive. I got home and 3 were literally empty. I was pissed and got my money back. Please don’t be that guy?
If my math is correct, 10 minutes per live snail.
Petco is great for buying cheap aquariums on sale, otherwise I stay far away.