I have used Epson aculaser C1100 toners in my 3000CN by setting non-dell toners in the menu, removing a small plastic tab that doesn't allow the toner to seat, and swapping the chip from the OEM toners to the Epson toners (otherwise, it gives an error) - I have replaced BLACK high capacity #0190 price ??? and CYAN standard capacity #0193 @ $74.99 plus tax to date with no issues (Office MAX locally stocks the aculaser toners) location: Middle Tennessee, USA. I don't know how the price compares to Dell, but I can buy off the shelf and make the modification with a pair of snips and be back in operation in about 5 minutes.... Hope this helps somebody else out...
FYI I had already turned on non-dell toner to stop the low toner message and it printer ran until toner ran completely out and then it couldn't calibrate, so I was down until swapping toners.
I usually run HP or XEROX but was given this machine by a customer because "somebody plugged into a 220 outlet and burned it up and did I want it for parts" but it has worked fine for me with no sign of damage, so I put my xerox phaser 340 in the garage and started using this one.
DIsclaimer: Obviously you use other toners at your own risk, and your warranty will surely be affected, but it worked for me.