Generally, I agree with the sentiment, but there are more and more options becoming available for good badger brushes under $100:
The knots that Rod from Stirling Soap has been sourcing for his finest badgers make really nice brushes, for around $50.
Razorock brushes are made by Zenith, and get pretty good reviews, even from collector dudes whose opinions I trust, including my own.
There are a lot of brush makers who sell affordable brushes on Etsy. Most of these guys use knots from Whipped Dog or Virginia Sheng, which are fine in their own right, but if you ask them in advance to use a knot from The Golden Nib, or Etsy Shave, you can step that brush up a tier for very little extra cost.
My single biggest advice is to stay away from "Silvertip" or three band brushes unless you are going to spend a little more coin. A million times I have seen a guy who says he wants to try a good badger, buys a budget silvertip, and then comeplains that it's floppy. In my opinion, there is no such thing as a bargain on a Silvertip. The hairs are softer and less stiff, so you need a ton of them to make a good knot. And a ton of hairs cost a ton of money. That's all there is to it.
-The Razorock High Mountain White from Zenith is a good brush. (Do not confuse with Whipped Dog's, which is a two band Finest.
-TGN Grade A Silvertips get good comments from people I trust, but I have not tried one.
-Envy Shave sells excellent knots.
The idea (my recommendation) is to stay with Finest or Two Band unless you are looking at higher end stuff. A lot of these knots have treated tips now, which make the tips softer, look better, and knocks the price straight into the basement.
EDIT* Fixed a typo.
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