I have a canon printer with the PG-30 cartridge, I purchased a 1 oz. refill kit on ebay for $4 it is for the PG-40 am I correct in assuming this will work as I believe the PG-30 is smaller in capacity than the PG-40. Seems like a good price as 1oz. will probably be enough ink to refill cartridge twice and it does not cost that much to experiment.