Newegg offers the ASUS 802.11n Wireless PCI Express Adapter, model no. PCE-N10, for $2.99, via the directions below. With free shipping, that's a buck under our mention from December and the best deal we've seen. (It's also the lowest total via-rebate price we could find today by $7.) It features WEP, WPA, and WPA2 encryption. Coupon expires March 27. To get this deal:

1. Add the ASUS 802.11n Wireless PCI Express Adapter to your cart for $19.99
2. apply coupon code "EMCRDCB52" to drop the price to $12.99
3. redeem this $10 mail-in rebate for a final price of $2.99