Depends on who is working, some people who are working there are cool and willing to go that extra mile to look for singles that aren't listed on their site. And then there's one or two staff members who will fully speak to you in a threatening tone and say they don't have something if the website says 0, but they have like 5 in the showcase.
Prices are somewhat pricier than other places but they do have an overabundance of stuff and you'll most likely find whatever singles you need for practically any card game.
They do have a large selection of board games and supplies for the products they sell so if you are looking for a place to get everything at one place, this is the place to go.
Overall you have to watch who's working there though as the customer service is definitely sometimes hit and miss, literally ranging from awesome to downright shitty. It's so bad that if I see certain staff, I just turn around and walk right out the door.
Tl;Dr: Go here if you're looking for anything card game if you can't find it anywhere else, watch out for some of the prices, and definitely find out who's working and judge each person yourself.