ThinkGeek cuts 30% off a selection of electronics and gadgets via coupon code "OFFBEAT". Shipping adds $8.95, but orders of $35 or more qualify for free shipping. (Pickup at ThinkGeek or GameStop stores is also available, but it costs $7.95.) A couple of best bets, with prices after the coupon:

Star Trek TNG Bluetooth ComBadge for $48.99 (pictured, low by $11)

Torque Customizable Headphones for $55.99 (low by $19)