Where to buy Physically currencies?

Hello!
I've asked this question on Rookie forum but no one answer.
I'm looking for broker where I can physically buy currencies at low spreads. I understand that lowest transaction volume may be 10,000 or more units of currency.

Simply I am importer and need lots off USD, CHF, EUR at low prices to pay for things that I'm buying.

http://www.forexfactory.com/showthread.php?t=173224

I not sure in other places but in Penang, there are A LOT of "Money Changer" all over the streets and shopping malls, not sure about the spread though.