Which Is Better

Ok, so the time has come once again, that I am getting messages the my ink catridges are low (both color and black). On top of that I am out of paper, a first in at least 2 yaers, when I last bought a box. My question is this. Office Depot, like others, offers $3 off or a free ream of paper, when you recycle your old cartridges. Which is better? The $3 off or the cartridges. I am not sure how much the free ream of paper costs (I am assuming it is the store brand). Should I get the 2 reams of paper or should I get the $6? Anyone with any advice, please speak up, I will be stopping by O. D. tonighht, on the way to my Financial Peace University class.