This may seem like a goofy question...but, can you go into BBB and buy costumes and other items without an appointment, or are those items for makeover customers only? If you can go in and buy, do they sell the makeup palette?
You can buy the costumes at any shop in Disney. They sell them all over the place. We went to the DTD BBB location, which is inside of the World of Disney store. I'm guessing World of Disney probably has the most extensive selection. You can also go to DisneyStore.com for costumes. I don't know if they are exactly the same ones online as they have in the parks, but they look cheaper online ($49.50, versus $64.95 seemed to be the average going rate at WDW). I'm not sure about the makeup palette, but it's nothing special. You can buy something similar at WalMart, I'm sure. It just has some eye shadow colors, lip gloss & one blush.