B&H Photo Video offers the Obihai VoIP Telephone / Fax Adapter for $59.99. Clip the 33% coupon on the product page cuts it to $39.99. With free shipping, that's the lowest price we could find by $10, although we saw it for $5 less in December. This adapter facilitates real-time fax over IP and supports Google Voice, SIP, and OBiTALK VoIP services.