Maybe I misread the site, but it looks like the guy is a custom maker who happens to sell other stuff. Given that, his prices aren't out of line with similar custom/small makers' knives. There are some lower, but also some higher. You have to evaluate the cost versus the materials, heat treat, and production method (forged vs. stock removal) he's using. If it's a well-built blade, I'd consider it as a bushcraft knife. Certainly they're not for digging holes or attacking cinder blocks, but they probably get the job done. There's the long-standing debate about whether a $300 custom is worth 3x the price of a Bark River or 30x the price of a Mora. I wouldn't start with the Bisons to muck around with, but after I figured out the skills with enough different knives to know what I liked and didn't like, it might be a nice investement in a quality tool.
YMMV
By the way, I have no experience with this particular company. I'm just arguing the price point, and advocating the possibility of actually using your pretty $300 knife. Also, there's a bit of a price bump for US customers, with currency conversion and customs fees. Usually we have it easy and the UK gets stuck with that sort of built-in markup for their blades.