I have used this company here in the uk and they are very cheap and I think you will struggle to beat his prices, I had 100 Double sided plated through holes,solder mask and slik screen (75mmX65MM) and it only cost £131.00 + vat for the hundered no set up costs, Yes the price may go up if you have less

http://www.tecbridgecircuits.co.uk/index.htm