Drive thru RPG or DMs Guild is probably the best way to get clean copies.
For those that are not printed physically I would do as follows, though you could do it for ALL of them.
I would go and buy the PDFs from DMs Guild.
I would then burn them to CD and take them to a PRINT Shop.
Get them spiral bound in a STURDY Spiral bound book on heavy duty paper. This should last with the use and abuse of a lot of handling and also lay flat on the table.
This gives you physical copies of the books as well as legally obtaining them.
Alternatively, you could also use something like Lulu.