Shop ThinkGeek House Brand Sales and Deals

ThinkGeek offers the Star Trek Motion-Sensitive Electronic Door Chime for $9.99 plus $6.74 for shipping. That's $3 under our December mention and the lowest total price we could find now by $13. It allows you to choose between "turbolift door" or "red alert" sound effects that play automatically when a lifeform crosses the threshold.

ThinkGeek offers the Scalextric Star Wars Race Track in Death Star Attack (pictured) or Battle of Endor for $39.99 with around $10 for shipping. That's tied with our March mention and the lowest total price we could find for either style by at least $31. The Battle of Endor features speeder bikes, while the Death Star Attack comes with an X-Wing and TIE Fighter.

At ThinkGeek, purchase one select T-shirt and get 50% off a second T-shirt of equal or lesser value. (The discount appears at final checkout.) Plus, cut $20 off orders of $100 or more via coupon code "20SMACKERS". That's only the second BOGO deal we've seen from ThinkGeek this year and leaves many items at price lows. (For further comparison, we saw up to 55% off a selection of T-shirts last week) Shipping starts at around $6 and some exclusions apply. (Spend over $75 for free shipping, although the above coupon will override this offer.)

A best bet is two Unisex Portal 2 Science To Do T-Shirts in Black for $26.99 plus $6.14. That's $16.57 per T-shirt, a saving of $9, and the lowest total price we could find. The shirts come in sizes S to XL.