Sonic Grenade $13
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The best deals can go quickly and don't always last as long as we first thought. Prices and inventory can be very fluid. There are many great deals that are still active.
Another one from StrangeDeals.com. This could be fun. Looking to get back at a coworker? Sleeping brother or sister? The Sonic Grenade is your opportunity to turn any calm, serene environment into total calamity. Set the hard rubber grenade to one of three volume settings, pull the pin, and throw. 20 seconds later, sonic mayhem. The best price on the Sonic grenade is at ThinkGeek, where it's just $12.99. If you're spending more than $25, use coupon code PORTAL for $5 off. Shipping and taxes vary by location. (Instructions »)
For a limited time, save $50 on a $100 purchase of Grad Gifts with code CONGRADULATION at ThinkGeek. A best bet is the pictured Kata Jumbo Rucksack (Model number KT DL-DR-467), which drops from $109.99 to $59.99 with code. Plus, send off this $15 Mail-in Rebate by 7/15/13 to drop the price to $44.99. Shipping adds $13.94 or is free on orders over $75. The best price we could find on this bag anywhere else is $95. It features a removable padded organizer, padded shoulder straps, and can hold up to a 17" laptop. It also includes a rain cover. There is no sales tax (except OH, VA, and CA).