Oh, as for deals, ticks, and tricks? Well, the Disney Outlet has t-shirts for under $5. You'll see those same or similar shirts in the parks for $25. I bought a few at the outlet to give as "party favors" to family at DD's Disney bday party, but misplaced the bag. I went to replace them and decided against it, at WDW shop prices!
Also, you can get a lot of the World Showcase merchandise elsewhere. We got DD7 a Minnie Mouse shirt at the Adidas outlet for $5, and the store at the German pavilion had it for $20 or more. You can get the collectibles at Hallmark or QVC (the holiday ones go on clearance after Christmas for up to 75% off). My local grocery store has a nice international section where I can get most of the exotic candies that they sell at Epcot.
Tricks? Don't want to wait in line? Know that most Disney merchandise is sold elsewhere on property. Pick a Pearl at the Beach Club instead of at Japan. Visit Art of Disney at Downtown Disney, HS, *or* Epcot.
Also, check quality before you check out. I wanted a dated Christmas ornament and couldn't find a non-broken one at Mouse Gear but we were running out of time before the end of our trip. This time, I found a shirt I liked, but couldn't find one without a big printing error. If I had just grabbed it off the rack and looked later, I would have been greatly disappointed.