Without knowing the country i can't, there's several euro countries with the euro currency.
What i can tell you is this, look for a decent psu within 400-450w, from brands like antec, corsair, fsp, seasonic, xfx, ocz, pc power and cooling, enermax, silverstone.
See if you can see any psu with the wattage rang and of any of those brands for 50 euros.