Costco, what is it good for?

So yesterday I finally signed up for a Costco membership.  I came away spending less than a $100.00 luckily.  I bought 200 clear garbage bags and some fruit snacks.  I plan on going back on Thursday as that is the day they get their shipments.  I’m looking to buy the Clorox wipes as I use them religiously at work.  They were sold out as of 11/26/05.  I also never got a good chance to shop around, I plan to thoroughly shop around and see what they have to offer.