Newegg offers the Polk Audio I-Sonic Audio System with iPod / iPhone Dock, model no. AM3395-A, for $39.99 with free shipping via the directions below. That's tied with our expired mention from five days ago and the lowest total price we've seen for this dock. (It's also a current price low by $85.) It features an iPod and iPhone dock, 4-speaker array, AM/FM radio, compact on-board amplifier, and more. Deal ends December 21. To get this deal:

1. Add the Polk Audio I-Sonic Audio System with iPod / iPhone Dock to cart for $99.99
2. apply code "MASTERPASS" to drop it to $89.99
3. checkout via MasterPass
4. redeem this $50 rebate for a net price of $39.99