Thanks for everyone's input. I seem to have found more adapters than actual mounts. However, I need to revisit whether or not an adapter might work as even the straight mounts are rather spendy. Due to the tight fit in the back of my Rav4 I was assuming that I would have to relocate the existing mount anyway. I need to actually put the bike in the Rav and check.

Here is what I have found so far for 12x100 through axle:

Stand-Alone Mounts

Delta Cycle - Mount comes with the adapter (BH6002-PRO)
Sunlite - Big block fork mount (Inconsistent prices and part numbers)
Saris - Thru Axle Traps (TR4BLK)

QR To Through-Axle Adapters

Yakima - (#8002116) $65
Thule - (#53012) $60
Hurricane Components Fork-Up - Enve Road $58
Delta Cycle - 2-piece mount/adapter (BH6002-PRO)

Thanks,
Steve