Amazon offers the TP-LINK N600 802.11n Wireless 4-Port Ethernet Router, model no. TL-WDR3500, for $29.99 via the directions below. With free shipping, that's the lowest total price we could find by $10. Sales tax is added where applicable. This dual-band router features four Ethernet ports, one USB port, simultaneous 2.4GHz and 5GHz frequencies, two detachable antennas, and support for WEP, WPA, WPA2, WPA-PSK, and WPA2-PSK encryption. Rebate ends April 1. To get this deal:

1. View the TP-LINK N600 802.11n Wireless 4-Port Ethernet Router to for $49.99
2. clip the $10 off coupon on the product page to cut it to $39.99
3. redeem this $10 mail-in rebate for a final price of $29.99