Lexmark has historically had the highest TCO of any of the inkjet printers. They actively prevent the creation of a clone cartridge market (at least here in the USA) for their printers so about all you can do is refill them yourself to cut costs. Dell's are modified Lexmarks so you have to buy the ink carts from Dell. You can buy carts refilled by others and theoretically they use carts that were only used once before, but one never knows. So I prefer to do it myself so I know the provenance of the cart I'm refilling (you should be able to get at least 5 refills from an OEM cart) - same for HP and any other integrated head cart.
. Almost everyone here knows I'm a diehard Canon fan and I don't think you can do any better than the Canon iP4300 among current model units. Have been around $90. shipped from the Egg. and were $70. AR at Staples last week. There are clone tanks available for $4. or less, but you do have to transfer the chips from the OEM tanks and go thru a bit of rigamarole to get the printer to accept the new tanks. Maybe by the time you run out of your first OEM tanks they will have gotten the chips down. But I wouldn't hold my breath... OTOH, if you are willing to pay more than original list price for one of the original Pixmas (iP3000, 4000, 5000, 6000D), you can probably find a NewInBox unit on eBay. And there is always the chance you'll get lucky on a bid or BuyItNow if the seller doesn't know what he has... Almost regardless of initial price, those will pay for themselves in low TCO and reduced hassle over time. Needless to say the output from even the 3000 (the one I owned before I got the 4300 and I had the i450 before that...) is hard to beat and the 4300 is no different.
. If you don't print a whole lot, your first set of OEM tanks for the 4300 could last you 4 months or more. I'm just about at the two month point on mine and I'm down about half on the photo black and about 2/3 left on my Cyan and those are the lowest - I print out a lot of PDFs and the black used for those is the photo black as they are really graphic rather than text files at it seems that shades of blue are favorites for spot color and highlighting.
.bh.