Mwave offers the GrandStream Enterprise Multimedia Gigabit IP Phone for Android, model no. GS-GXP2200, for $155.48 plus $2.99 for shipping. That's the lowest total price we could find by $12. Features include a 480x272 LCD touch screen, six lines with up to six SIP accounts, 5-way conferencing, dual Gigabit Ethernet ports, Bluetooth, Android 2.3 OS, and support for 3rd-party applications such as Skype.
With these companies, it might be easier than you think to negotiate your monthly bill down.