There are a number of commercial substantially sub-$1k prosumer overhead book scanner options now that have nicer work-flows and more automated post processing than the DIY book scanners folks used to hack up (or hand feeding a flatbed) - I think they came out of and subsequently took took a lot of the air out of the DIY efforts. CZUR has been pretty generous with giving book scanning rigs ( https://www.czur.com/product/ETscanner ) to prominent hobbyists (I think CuriousMarc and Shelby from TechTangents and a couple other retrocomputing type youtube folks got them - apparently it was a good marketing move, that's why I'm aware of them).
The two downsides to those rigs here are that it looks like this effort is aiming for 600dpi capture and that would be a ...reach... for the reasonable cost overhead systems, and (Using it as an example because I've looked at theirs) CZUR's machines only go up to about an A3 scan area, while computer shopper was a ridiculous 13x10" format which would be a bit too big to do in the expected 2-up workflow with their units.