Uniqlo.com has all of their t-shirts (including Disney/Pixar) on a special promotion this week for $10. Also check the Disney Stores that are located in outlet centers. The ones near me have a decent selection of clearance t-shirts from Disneyland that end up costing less than $10.

I wear my powerpuff princesses all the time and get so many compliments. Plus, they're different than what everyone else is wearing!
and have been happy with all of them! It might not be super cheap, everything is around $20, but they seem to always have some type of sale/free shipping promo going on. The tanks especially are nice because they have a nice variety of characters/movies to pick from. They are also always adding new products. I was able to find tanks with my favorite scenes from TLM and Up on them so those will be trip staples from now on. They are really comfortable and cool to wear to the park as well! I say if you can find one you love, splurge for your trip!
