At Staples stores, recycle any HP-compatible Inkjet or Toner Cartridge and get $10 back in Staples Rewards with the same-day purchase of a new HP ink or toner cartridge. (It's valid for up to three cartridges, or $30 in Staples Rewards.) That's the best Staples Reward "cash back" we've seen on HP printer supplies. Sales tax is added where applicable. Deal ends November 19.