Obihai OBi202 VoIP Telephone Adapter for $39.99 after this $60 rebate. Shipping is $4.68 for a total of $44.67 shipped. Here is a screenshot before the $60 rebate for your reference. It works with up to 4 VoIP services, including Google voice, Anveo, Callcentric, and features a 2-port router with integrated quality of service and 2 phone ports. Most places have it for about $69.