Amazon offers its Prime members the D-Link DWA-125 802.11n USB 2.0 Network Adapter for $19.75. Clip the $10 off coupon on the product page and it falls to $9.75 in-cart. Plus, Prime members qualify for free shipping. (Non-members can spend $25 or more to qualify for free shipping; otherwise, shipping costs $8.25.) That's pennies under our May mention and the lowest total price we could find by $8.