I did not go to the last one that was here, but the line to get in was apparently about 1 hour long. Tickets are $7 if you print a coupon and bring it with you.
There are good deals and bad deals, but everything is generally on par with retail sales. You find the best deals on the first day for high demand items, and on the last day for left overs that retailers are trying to get rid of.
You just need to know exactly what you are looking for and what you are willing to spend for it.