DisneyStore is offering free shipping with any Marvel item purchase. I found several art sets that are marked down over 50%. The Spider-man art set above is $5.99 ($12.50 orig). They have tons of items on sale. You can get free shipping as long as one item is a Marvel product. Click this DisneyStore link to get started and use promo code: THOR to get free shipping. This offer is valid through tomorrow 5/7/11.
To further sweeten this deal shop through Ebates or Shop at Home to get cash back on your purchase. I use both of these cash back sites and love them!