There is a printable coupon available for Staples stores to get a free ream of HP Colorlok paper after rebate.
This is valid 4/13-4/16 only and you will pay the full price of the paper and a rebate form should print on your receipt. The rebate information can be entered online and they will mail you a check that you can cash.
There is a chance you can also use the $1/1 HP Colorlok paper coupon (located under office supplies)- so it is worth a shot but I am sure some stores will refuse to allow both coupons.
Usually you need to be a member of the free Staples Rewards program to be able to get rebates.
This is the third time that Staples has had an offer for free paper in the past few weeks and I haven't any problems using the $1/1 coupon or submitting for the easy rebate. The other two times it was just an advertised deal in their flier and you didn't need to have a Staples coupon so I don't know if there will be issues using the $1/1 coupon this time. As soon as I have a chance I'll stop into Staples again and try it out. Printing all those coupons takes a lot of paper so if I can get free paper that makes it all the better!