US Micro Corp via Rakuten offers the refurbished Dell Optiplex 755 Core 2 Duo 2.2GHz Desktop PC
(no monitor), model no. 755U-2.2C2-2-80-DVD-7P, for $189.99
with free shipping
. That's only $50 more than a similar refurbished Optiplex 755 with half the RAM and half the hard drive capacity sold elsewhere. Features include an Intel Core 2 Duo 2.2GHz dual-core processor (the exact model is unclear), 2GB RAM, 80GB hard drive, DVD-ROM drive, Gigabit Ethernet, and Windows 7 Professional 32-bit.
A 60-day warranty applies, although it's unclear who supports it.