I have lots of three ring binders for sale and many are new those that are used are still in good condition.
Prices will vary based on size.
16 new 3" binders - $5 apiece
5 used 3" binders - $3 apiece
4 used 2" binders - $2 apiece
15 other used 1-2" binders - $1 apiece
Make an offer and you can take them all