Just got my order from Monsterinkjets.com for BCI-6x ink tanks. I have run 20 pages of text and then art and pictures. Compaired them to orginal test on true canon tanks. Very slight difference but only seeable if you nit pick and know what to look for. Have been very happy. There prices AND free shipping [ground] <over 10$ order> is the best I found. Ground took 10 busness days [US Snail Mail].
Printer Canon s820 - tank BCI-6x
BCI-6x canon tank = about 12$ + s/h
BCI-6x generic tank=1.45$ each no s/h <over 10$ground ship order>:)
they seem to deal right now in epsom , canon, apple, xerox TANK ink.
Edit: corrected the addy.