At ThinkGeek, buy one item and get 50% off a second item via coupon code "SMASHIT". That's the best such offer we've seen from ThinkGeek since November, when we briefly saw a buy-1-get-1-free offer. Shipping starts at around $6, or get free shipping on orders of $75 or more. Deal ends January 23. Some best bets, with prices after coupon:
two Doctor Who TARDIS Shower Curtains for $44.99
two Tactical Chef Aprons for $52.48
If the price of ice cream plunges, more people will buy it, right? Not so fast. Watch this video to learn how the human mind influences buying behaviors.