Krause Publications is a niche publisher. Probably the majority of the books and ebooks that they sell have to do with collecting and similar types of hobbies.
Their bookstore is currently offering 30% off of all books and ebooks. A large number of the books are marked down already. I noticed some 50%, there may be some with a higher discount than that. The 30% will stack on top of that discount.
This sale is not only of Krause Publications, but also of other publishers whose publications are regularly sold in the Krause Publications Bookstore. The publications from the other publishers encompass a large variety of non-fiction subjects, not just on collecting and such.
All of the ebooks probably will be in the PDF format. At least some of the titles are not available at all as ebooks at Amazon. Of those that I checked, the ebooks at Krause were less expensive than any new physical copies that Amazon sells.
Some of the ebooks at Krause with the initial markdown, as well as the 30% off, are difficult, at least, to find. I checked one on
Luzme.com (which claims to find the lowest price on any ebook), and they could not find it at all.
Ebooks.com had it (sorry, I don't remember which format it was in), but the price was about
twice what the ebook would be at Krause with the discounts.
I say all of that to say this. You may have to do some hunting, but if you do, you're likely to find some ebooks that are hard to find and/or hard to find at a good price.
I suggest that you start your odyssey at
this webpage at the Krause Bookstore, and select the way that you would like for them to be sorted. To get the additional discount, use code RENEW30 at checkout. The extra 30% off is good through May 15.