Don't over look the many styles of flies designed for other species or waters. Although I tie & use flies that are popular for bass, I also use many other types when targeting bass. The bass don't care what we call them.
For example, there are fly patterns intended for Steelhead or Salmon that work equally well for bass, particularly Smallmouth Bass since most of these flies are used in riverine environments. Intruders and MOAL styles flies are some favorites of mine for SM bass and LM bass like them also. There are many "saltwater" flies that are excellent for targeting bass too. One of the first saltwater fly types I tied were Keys style Tarpon patterns, and I used them for LM bass.
Of course, some styles of flies are a better choice for the specific type of water being fished, and some will be equally effective in different types of water.
If I was listing the flies I've had the most success with for bass, they would be:
Clouser Half & Half
Various rabbit strip patterns.
There are many others I've used with success but these have all worked well for me for a very long time, so I always carry them when chasing bass.
So, look around for sources for your flies, and include other key words than simply "bass flies" and you'll have a much wider range to choose from. I tie most of my own, but have purchased some to try, or to copy with my tying. There are some very good tyers around that provide excellent quality at reasonable prices. You may pay a little more from some, but the quality will generally be better too so the flies will last longer.