237 days ago(+1)
Presto Photo for $86 USD gets you a hard cover HKRPG book.
https://www.prestophoto.com/help/8.5x11+Photo+Book
I also printed the expansion "Lands Beyond" in full color saddle-stapled booklet format for $10 each at my local Office Depot Print Shop.
https://www.officedepot.com/b/booklets/N-1212284
The "Hollow Knight Wanderer's Journal" is a beautiful book and amazing visual companion for both players and GM and can be purchased for $32 here:
https://www.fangamer.com/products/hollow-knight-wanderers-journal-book