I went to Cambridge LSAT website today and I can see PT75 and 76 for sell at 10 bucks each. https://www.cambridgelsat.com/preptests/4-section/ Are these legit?
Don't bother binding. Turning the page takes the same amount of time bound or unbound and if you have made it this far in life you shouldn't have an issue with this on test day just because you didn't bind your PTs.
... 13 weeks) to take 45 preptests (36-76, Superprep A-C ... able to take 3.46 preptests a week on average and ... case an incremental 5-10 preptests won't matter too much ...
There's also the Manhatran book that has them broken up by type.
The Cambridge printed book is still available on Amazon, although yesterday, they didn't link to it directly which was weird... But it's $100 used copies start at $45