Which is why they are suggesting ordering through a comic shop (as well as that way they may also order one for the shelf too).
To be fair to very small publishers that is what it costs to mail stuff individually and securely. We see the same problems with Kickstarter stuff too and a lot of those that initially promised ‘free international shipping’ hit a serious loss. There’s every chance this is just run by one or two people, 8 books in nearly 3 years, my mum did more than that on her own with a small press out of the back room in the 80s.
Ordering through shops means they use the existing distribution platforms and the economies of scale those bring. That’s why the TKO stuff was so much cheaper through the Big Bang and Forbidden Planet.
As a digression I think this is where something like print on demand could see a future. It’s been seen mainly just as something for vanity projects but if you think about it many of the trades on the shelf next me have taken the following journey: Printed in China, sent to a publisher warehouse in the US, ordered by a bookstore in Malaysia and sent back out in the same direction. If you had a company operating in multiple countries that could print the same material then you could just instruct them to run off a copy for Ben in South East England and post it out at local rates (plus a massive carbon footprint reduction).