BG2GZW Pay attention to Qianzhou, then go and grab the coupons. It seems like you can combine several coupons you get, but I haven't tried it. If you're lucky, you might be able to get a large amount at a lower price than JLC. As for processing accuracy, I still think JLC probably puts more effort into it, because after all, you're just making samples. It's basically getting a bargain. You can't really complain if others don't put in as much effort sometimes.