Mega Bloks Big Building Bag $6.37 Shipped *Best Price* The links in the post below may be affiliate links. Read the Full DisclosureNovember 26, 2018 by Kim Julian Leave a Comment Today ONLY, save an additional 15% off at checkout on all of your Target purchases. That brings the price of this Mega Bloks Big Building Bag down to just $6.37! This is the best price we’ve seen. Even better, all orders currently ship for free! Plus, Target REDcard holders save an additional 5%!