Ink carts for my printer locally cost $30 for each tri-color set and $20 for each black. A local pawn shop has 3-sets of color 2-sets of black with an expiration date of 04/2010. There offer was all 11 ink carts, still sealed and all for $35. So is buying expired ink carts a bad thing? I realize the ink may be dried up, but there all still sealed from the manufacturer. Don't want to ruin my print head also. Thanks.