I agree with Jevny, When using SLS or SLa the Chinese prices are usually more than Europe, this is because of high import taxes on the machinery ( usually they are from out of mainland china, think of the EOS SLS machines from Germany) .Also you have the consider lead-times and forwarders/express delivery times when using Chinese vendors.
Personally i think , still cnc machined mock-ups and silicone molding ( RTV) are technologies that are very competitive in China. We use an other http://www.prototypingchina.com prototyping china company Triple-c, and have good experiences with them on both CNC ( ABS/alu/Steel/POM) and silicone molding.