There is a $1/1 U by Kotex coupon available (for those that have not printed it lately)! You can print it to get cheap liners at Walmart and CVS…

CVS

U by Kotex 18 ct Liners — $1.49
Use $1/1 printable
Total: $0.49

Walmart

U by Kotex 18 ct Liners — $1.24
Use $1/1 printable
Total: $0.24