It was
$23 New less than a year ago unfortunately. :(
This happens mostly because of how eCommerce has evolved. I'm not 100% sure, but my guess is that the algorithms of all the online sites study each others' products and prices in a way that similar to the stock market. When a scenario occurs where there are limited places that
sell the book, many sites' prices seems to go crazy like this. Recently I noticed this problem with
Power of Duck as well.
The only solution I can think of to fix this, is for Sepp/Publisher to pump out more
books at a more reasonable price.
p.s the German version of it, Der Agrar- Rebell, is selling for $20.
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Considering you are in the US, the best bet for now might be to
add it to your wishlist and get notifications if any Used copies become available. Chances are it'll still be a high price on Thriftbooks as well, but likely not over the $100 mark at least. (even though the thumbnail is German, the language version below says English)