Jeff -
The selection of film holder manufacturers is extremely limited. Fidelity (which also includes Lisco) was purchased by Calumet a while back. Urban legend is that there was one guy who actually ran the manufacturing line, and when he retired, Calumet decided to mothball everything rather than hire a replacement. As a result, new Fidelity/Lisco holders are no longer being manufactured.
That leaves Toyo and Chaminoix, a new supplier in China who appear to be concentrating their efforts on the non-standard sizes. There are also a few artisan shops in the US - S&S, AWB, etc - but they also are focused on the ULF niche.
You may be able to find old "new stock" holders at places like Midwest Photo. I bought a set of brand-new, in the original box with instructions Graflex holders last year at a flea market - and they havn't been made in 30 years!
You are right that the prices seem to have escalated enormously over the last 3-4 years.