It is a 99 cent store. Everything in the store is 99 cents. The store I went to had about 40 cans but stock changes in them all the time. They sell until they are gone.
Tip #2 If you like good stuff coming out of the kitchen, this is the only place to buy common spices. Things like peppers, onion, garlic etc. go for about 20% of what you pay in the supermarket.