We stumbled upon a rather interesting "stackable" 18 GPU coin mining rack which is, believe it or not, currently on sale for €8.495 and features no less than 18 Club 3D HD 7950 GPUs.
This is currently Geldfabriek's flagship product with open air, fully modular, configurable, expandable and stackable chassis and exclusively aimed just for coin mining. It is based on three ASRock H81 Pro BTC motherboards, three Intel G3220 dual-core CPUs, a total of 18 Club 3D HD 7950 GPUs, three 900W and three 700W PSUs.
According to Geldfabriek, the FABRIXX Stacker 18 GPU mining rig can produce 11.2Mh/s in 24/7 mode and 12.2Mh/s in turbo mode where it is rated to work "several hours". It also comes fully assembled and configured with optimized mining configurations and selection of .bat files for the currently most profitable coins/pools.
Although the price might be "a bit steep", with current price of coins, it could certainly pay off if the price stays at that level, of course.
Source:
GeldFabriek.nu.