This guy is selling a complete toner cartridge set (compatible not original) for £20.90 including p&p – which seems quite reasonable.
http://www.ebay.co.uk...N&hash=item415cb857d5
It is common practice for both ink jet & laser printers to be sold with low filled consumables – as this is where they make their money.
Remember that manufactures will normally quote typical prints expected from a cartridge based on 5% area coverage. If you are printing photos (at 100% coverage) you will need to divide the figure by 20.
You can also buy replacement microchips to allow refilling - if you like getting messy.