As promised here is the vendor and contact \ owner is Eric Strauss. Mine went for 85.00 with the straight bar. He had some first runs with flaws (scratches) on the "S" bar and he let the (bar alone) loose for $15.00. I only use the the "S" bar now. His website states out of stock for all his bars, but he is probably just waiting for some orders to have some more fabricated/manufactured. The product is qaulity and worth every penny.
AMT Engineering - Products - Motorsport Products for the Active User
Only other one I found with search on keyword "car camera mount headrest" is this one (would not recommend). Found it on flee-bay (EBay) for 49.00. Looks cheesy.
RacerMount In-Car Camera Mount Attaches To Your Seat Headrest | eBay