eCOST.com offers the refurbished Panasonic 2.4GHz Expandable Digital Cordless Phone, model no. KX-TH111S-B, for $43. With $11.23 for shipping, that's $46 below the lowest total price we could find for a new, factory sealed unit. Features include speakerphone, expandability up to eight handsets, caller ID, built-in answering machine, and more.

Note: A 90-day warranty applies, although it's unclear who supports it.