Head over to your local Target and grab some Always Discreet Liners for Free! Here's how:

Always Discreet Liners $2.99
Use $2.00/1 Always Discreet Incontinence Liner (coupons.com)
And Use $1.00/1 Always Discreet Target Mobile Coupon (Text DISCREET to 827438)
Total: Free!