Look for a Bitmain S1 or S3,bout as cheap & easy as it gets 
Thanx, it's Hashrate: ~190 GH/s for 159 euros,is it a website where we can find the ratio Hashrate/euro or Hashrate/$ with latest prices ?
Ebay or craiglist kind of publication/online sales/swap thing
This is US,but gives you an idea:
Bitmain S1
http://www.ebay.com/sch/i.html?_from=R40&_trksid=p2050601.m570.l1313.TR1.TRC0.A0.H0.XBitmain+S1.TRS0&_nkw=Bitmain+S1&_sacat=0
Bitmain S3
http://www.ebay.com/sch/i.html?_odkw=Bitmain+S1&_osacat=0&_from=R40&_trksid=p2045573.m570.l1313.TR3.TRC2.A0.H0.TRS0&_nkw=Bitmain+S3&_sacat=0
You will need a PC powersupply to run those,should say what size(wattage) in the listing.
Get one of these to fool your PSU into thinking a motherboard is attached:
This guy has those Cablez