Get yourself to your local comic book store* and pick up some free goodies to celebrate Free Comic Book Day!
You can also celebrate by visiting Things from Another World, which is having their spring cleaning and lots of sales during the month of May. Here are two coupons:
Free Domestic Shipping on $25+ IN-STOCK ORDERS with Coupon Code: ROCKOUT
$5 off Any Order for $50+ IN-STOCK ORDERS with Coupon Code: CLEANUP
* For me, that would be Alameda Sports Cards and Comics, where they will sell you something awesome and drink you under the table.