Not all of them, but there are a number of ebooks that are currently $1.99 on Amazon. Not sure how long the sale will last - I saw it yesterday and it's still there today. Some of the ones I saw were London, Naples, Germany, Sydney, Australia and so on. Looks like they are all 2022 editions. I think this link will work but if not, just search for "DK Eyewitness" in the search bar.
https://www.amazon.com/s?k=dk+eyewitness&i=digital-text&crid=1SNM3KZXCV0Y6&sprefix=dk+eye%2Cdigital-text%2C117&ref=nb_sb_ss_ts-doa-p_1_6
There is also a copy of the Rick Steves' Italy guidebook on sale for $3.99 (Kindle version).