Micro Center offers the Belkin N150 802.11n Wireless USB Adapter, model no. F9L1001, for $4.99. Opt for in-store pickup to dodge the $5.99 shipping fee. That's the lowest price we could find by $2 and the best no-rebate price we've seen. (We saw it for a buck less after rebate three weeks ago.) It features up to a 150Mbps data rate.