I work for a great wholesale office supply company called Garza Office Supplies.
1-800-716-4408 ext 136 ask for Mike Pollack the Jet fan
We specialize in compatable toner cartridges
HP 4000---------59.95 ea
HP 4100---------69.95 ea
HP 8100/8150---89.95 ea
We have all makes and models as well as oem
Free Shipping as well as good Jet talk
P.S. Cost is much higher for Dolphin and Patsie fans.
Prices are for any size business , however I cannot work with consumers.