I am sorry, what does OEM stands for when talking about PSU?
Central europe, availability is not that great. They got most of things that people are buying but the price a weird. Most items are a bit more pricey, some of them are like 2x price you can find on new egg or more.
Weirdest thing is that when you look at benchmarks you can find hardware that is less expensive and actually better than other stuff. You can find cards that are beeing sold for about 200 euro (world wide) for 500 or 600 and their performance is much worse than other cards in that range.
I am willing to buy it from 4 local shops and their good and price differs a bit but in general I can pick one of this (from 35 - 65 euro range). If there is something you would recommend I could look it up in shops if it would be within my budget.
CRONO PS500Plus/ 500W
CRONO CR-600
Cooler Master Thunder 600W (RS600-ACABM2-WB)
HIEFTEC GPA-500B8 500W
ZALMAN 500W ZM500-LX
ZALMAN 700W ZM700-LX
FORTRON GREEN POWER OEM 550W AX550-60APN
FORTRON 550W AX550-60APN Green Power
EVGA 500W / 80 Plus
CHIEFTEC GPS-600A8 600W
SilentiumPC 500W Vero
FORTRON HEXA+500W
ZALMAN 500W ZM500-GV
EVGA 500B 500W
SEASONIC 500W SS-500ET T3
CHIEFTEC GPS-700A8 700W
I've eliminated stuff like eurocase and probably would exclude crono, hieftec, chieftec as well. So it looks to me that the best choice would be ZALMAN 700W ZM700-LX or EVGA 500B 500W.