Unfortunately, they seem to be discontinued in just about every online store. Lately, the demand for these seem to be high, but the supplies are now low.
I had to dig through ebay to find a pair, but it may take a while for one to pop up.
You can also try looking in SVTP.com. But again, this may take a while.
If you don't feel like waiting, just suck up the $400+ and buy new ones from Randy Stinchcomb. The good news is they come pre-painted.