I need to make my design smaller, and the only way to do that is with a 4 layer pcb. I've seen the threads about where to get pcb prototypes made cheaply, but cheap appears to only apply to 2 layer boards. Everywhere I've looked it's at least $200 for a small 4 layer prototype. Where do you guys get your 4 layer prototypes made and what do they cost if you don't mind me asking?