Epson Stylus Photo PX660: Ink costs
Refreshingly for a printer at this price, Epson gives the option of fitting standard-yield (Hummingbird) or high-yield (Owl) ink cartridges for the PX660.
However, while the high-yield cartridges enable you to change cartridges rather less often, they're also considerably more expensive. It's disappointing that, while ink costs with the standard-yield cartridges are pretty high at about 20p and 77p for 6x4-inch and A4 photo prints respectively, you'll probably only save a couple of pence per print if you buy the high-yield cartridges.
Once you add genuine Epson Premium Glossy photo paper into the equation, overall photo print prices work out to about 36p for a 6x4-inch print and £1.45 for A4.