I've got 3 bitcoin mining rigs that I'm considering selling before I move across the country.
They've been running about 3 weeks, nice and stable, generating me about 1.5BTC/day through pooled mining. If you're interested in getting involved with bitcoin mining or are expanding your mining capacity, let me know if you'd like to buy one, two or three of my systems.
One is configured as: 2x ATI HD6950
(XFX), generating 640Mhash/s without any special overclocks or special cooling. 750W PSU, 500gb HD, Ubuntu 11 x64, 2gb RAM, AMD Sempron 140 Sargas 2.7GHz CPU. One open PCI-E x1 slot. $725.
Two others are identical configurations: each with 2x ATI HD5830
(Sapphire) and 1x ATI HD6870
(XFX), generating 880Mhash/s without any special overclocks or special cooling. 950W PSU, 500gb HD, Ubuntu 11 x64, 2gb RAM, AMD Sempron 140 Sargas 2.7GHz CPU. Two open PCI-E x1 slots. $925.
Both good quality system cases and can run stable with stock cooling closed, but you may want to keep the side open or add additional cooling if you want them to run silently.
I will accept $2500 in cash for all three (-$75), or the prices listed individually. I will consider selling different configurations of GPUs with the systems but will not part them out.
If you can pay in bitcoins I will give you a 4% discount off the current market price at the time of transaction.