Where can I buy the cheapest WOW EU Gold?

I suggest the cheapest would be to grind it out yourself. Do NOT EVER BUY WoW gold because the gold farmers will Hack into your account to steal it back. Most gold farmers get their gold from STEALING it from other accounts using key loggers. My level 70 warlock was hacked into. When I got my password reset and logged in my toon was naked and all my gold and items were GONE. Then my account was BANNED because my account was "exploiting the economy."

Best way to get gold, become a skinner, miner or herbalist. Gather and sell on the auction house. Don't be lazy and buy gold. You will get a better feeling of accomplishment if you earn it yourself.