newegg offers the refurbished Targus Universal Docking Station with Digital Audio, model no. ACP45US1-50-B, for $10. This $10 mail-in rebate cuts it to $0. With $2.99 for shipping, that's the lowest total price we could find for a refurb and $107 under the best price we could find for a new one. It features USB, audio pass-through, Ethernet, and is compatible with Windows 7 and Vista. Rebate expires October 23.
A 90-day warranty applies, although it's unclear who backs it.