The Disney Store is offering free shipping on Marvel items with the coupon code MARVELSHIP. This offer is valid through 5/6/12. Check out the 7 Figure The Avengers set on sale for $10 (reg $19.95). Or there are some cute plush items for $6 as well.
There are also some Marvel flip flops 2/$10 and beach towels for $12.50, some tees for $6 and more.