In an epic battle of the geeks ThinkGeek is offering customers $20 off orders of $100 or more on either Star Wars or Star Trek products. If you are a Treky and live by the command of James Tiberius Kirk, you may want to use coupon code LIVELONGANDPROSPER. However, if you are a fan of Darth Vader, you should probably use coupon code MAYTHEFORCEBEWITHYOU when checking out. Orders of $75 or more also qualify for free US Economy shipping. This battle won't last long, the deal expires 07/01/2013.