[OJFord]

I'm not so sure, I had the same reaction to your comment, but then clicked through; it's a set of five thick books, essentially a history book, two textbooks, and two recipe books, at $125ea. Pricey, definitely, but phrased like that I think not so ridiculous.

[huhtenberg]

Even for 5 books it comes out to $125 per book and you must get all of them.

This doesn't really qualify as pricey.

[Retric]

It compares more favorably with collage textbooks which you could use these as.

Niche books can justifiably command higher prices.