It stands for Annual Pass. They range in price from $200-$500 (depending on black out days) with an extra $100 for parking. That makes it a little expensive for the family to have right now. Typically the new star tours merchanise is only available in the park. Annual Passes also give discounts of 10%-15% depending on pass level and store. That is why I was able to give you a good discount last time.
Please note that it is not an easy thing to buy stuff there. You have to do deal with parking, the tram, security checks and getting into and out of the park. They do make it nice that they will hold you packages during the day. You can buy stuff in the morning and pick it up at the end of the day anywhere in the park. If you don't pick them up within three days, they ship them to you.
Last time I layed out about $600 and had to make three trips. (of course you guys paid really quick except one guy that never did) This time around, I'm guessing I'd have to lay out about $800 and have to figure out how to drag them out of the park and find shipping boxes big enough to fit them. It sounds really expensive to do.
I'd love to do it but I just can't right now. Maybe next year. Besides, this stuff will hang around for years. There is no rush.