mwave offers the refurbished EnGenius 802.11n Wireless USB Adapter
, model no. EUB-9707, for $6.99
with free shipping
. That's $5 under the lowest total price we could find for a new one, although we saw a refurb for $1 less last spring. It features WEP, WPA, and WPA2 encryption.
A 30-day warranty applies, although it's unclear who backs it.