Checkmate is a savings app with over one million users that have saved $$$ on brands like Amazon.
The Checkmate extension automatically applies Amazon discount codes, Amazon coupons and more to give you discounts on products like 100Pack Rigid Mailers Stay Flat Photo Document Mailers 6x10 Inch Self Seal Cardboard Envelops Mailers White Paper Mailers for CD, Photo, Picture, Letter, etc..
Checkmate users have also been loving these products from Amazon.
Users have been saving products like this to their collections.