For my small ventures ( <1000 euro) I've used bitonic.nl. A dutch site using the standard dutch banking system iDeal. First time I bought it took a day for a te

For my small ventures ( <1000 euro) I've used bitonic.nl. A dutch site using the standard dutch banking system iDeal. First time I bought it took a day for a test transaction of 0.01 to confirm my holding the account. When I recently sold (back to that same account) I received the money by 13:00 of the next business day. Not sure how this works for non dutch citizens. Presumably a dutch bank-account suffices. They don't seem to be an exchange though. Instead they are essentially market making, keeping their own supply. You don't have an account there. Instead, when selling they present you an address to send to, and when buying you give them the address to send to, Moving 500 BTC there in a single trade would probably exhaust their supply. At the moment they report 250BTC+, I've seen ~150BTC the last few times I checked. Still, it seems to be an actual functional on/off ramp for BTC - EUR.