Mining rig on 4x 290X = 3.5Mh/s. $2500

[Fiber]

Everything is ready to mine!
Hash rate is 4 * 892 = 3568 kh/sec

Configuration:

Videocard:   XFX Radeon R9 290X
Mainboard:   Asrock Z77 EXTREME9
Proc:   Intel i5-3340
Memory:   GoodRam Play! DDR3 4GB 1600MHz CL9
HDD:   WD 3,5" SATA-3 7200 250GB 16MB WD250AAKX_WD
PSU:  1x  Zalman ZM600-LE 600W
PSU:  3x  Zalman ZM500-LE 500W
Electricity Stabilizer:   Luxeon SVR-5000

Total price $2900.

I can sell without PSU and stabilizer (those are pretty heavy for shipment).

[Fiber]

$2900

$2500