I realize that a lot of folks may not be familiar with the sound quality of GR-Research speakers so to put this into perspective, parts and material cost to build these speakers the way Ron has is somewhere around $450. Then you still have to put in all the labor (and have the tools) to build them.
If you are unfamiliar with Ron's work it is top notch. I have bought a pair of his speakers myself.
A brand name pair of speakers at this quality level would cost at least $1,200 - $1,500. All for $300.
Mike