DealGenius via eBay offers the JOYSTICK-IT Arcade Stick for Apple iPad / Android Tablet for $7.99 with free shipping. That's the lowest total price we could find by $2, although we saw it for $5 less in May. This device sticks to the glass over a tablet's on-screen control pad to become a gaming joystick that can be removed and repositioned. It's compatible with any capacitive touchscreen device, including Apple iPad and Android tablets.

Of note, it's not guaranteed for delivery by Christmas. If you need it by then, The Gag via Amazon offers it to Prime members for $9.95 with free shipping. (Orders placed by December 21 via Prime will arrive in time for the holidays.) Not a Prime member? Order from ThinkGeek for $4.49 plus around $6 for shipping today (December 19) by 11:59 pm ET for guaranteed delivery by Christmas.

Update: As a reader found, HoboNinja offers it for $6.99 with free shipping. It's not guaranteed for delivery by Christmas.