Mad if you are talking about direct printing the R200 can do that too, as with the R300 you must have a pictbridge copatable camera. It is a matter of personal taste where the features are concerned, I didn't see the pint of all those extra doo-hickies when I can run the pics through my PC and get better results.
As to ebay try your local shops that is where I get my compats and at Â£7 for the 6 for the R200 and Â£6 for my C64 keeps me happy and I have never had a problem with the ones I buy, I have a thing about supporting local business as much as possible.
Freak you are the one who is missing the point slightly. It is Â£7 for all 6 cartridges not Â£7 for each one. That is what is meant by a complete set. If bought seperately they are as little Â£2 each. You can always tell when one need changing as the printer tals you when you are getting close to empty. Add to that the printer is so old I doubt you can get it new anywhere now. It has been shown in the long run it is cheeper to run seperate cartridge printers than the combined types because you only need to replace the colour that has run out, it is cheeper enviromentally too as you are using the resources to the full capability.