If you buy in bulk very.Occasionally they have good deals on electronics,I bought 2 of my big screen TV's from them.They also sell cheap pizza slices and hot dogs that taste pretty good.
I was in a Kmart in Cancun but since seeing Idiocracy about ten times I must go to Costco, I like pizza... hehe.
Walking into a similar place in Medellin Colombia, PriceSmart I automatically said "Welcome to Costco, I love you" and my girlfriend still thinks that is the first time I said the three little words to her.