They have HP Colorlok paper priced at $5.99
Use the $1/1 printable coupon (listed under office supplies)
and submit for $4.99 mail in rebate
Final price: Free!
*You will need to be a Staples Rewards member and the rebate prints right out on your receipt. You can enter it online and you will receive a check in the mail that you can take to the bank and cash. So this really is free with the exception of tax.