Staples: $25 Off HammerMill Copy Paper 10-Ream Case Coupon Posted on March 8, 2013 by Heidi Take $25 off the purchase of a case of Hammermill 8.5″x11″ CopyPlus copy paper! 10 ream case, limit one case per customer. Use online or in store! Makes a case of paper only $25.43 after coupon! Picture of my cart below!