I'm sorry to veer off topic but is anyone else infuriated that a brand new hard cover edition of this book is $13 (or as low as $7 from other sellers) but the K

I'm sorry to veer off topic but is anyone else infuriated that a brand new hard cover edition of this book is $13 (or as low as $7 from other sellers) but the Kindle version is $15? I don't even own a Kindle but that's ridiculous pricing.