Cast members have access to discontinued merchandise, damaged merchandise, and items left in lost and found. There's a store behind Magic Kingdom that sells items pulled from the park shelves at discounted prices for cast members. Then there's a trailer next door that sells damaged merchandise and lost-and-found items. I bought a Pirates of the Caribbean shirt that retailed for $40 for $4 because it had a hole in the seam. It took maybe five minutes to sew it up.
If that isn't enough for you, there is also a huge sale twice a year for cast members that's basically a cleanout of the merchandise. It's held in huge tents and only open to cast members and their guests. My favorite thing about those were the supercheap trading pins. I got grab bags of 10 pins with a lanyard for $10. Now that is a great deal.