Having had some VERY bad experiences trying to order discounted Canon photo papers recently through third party sellers, I gave up and paid the full retail amount through Amazon. However even paying their non-discount rate, this 20-sheet box of paper gives you prints at less than 37 pence each (EDIT: checked prices on 15/07/11, Amazon price has now dropped to 30p per sheet).
This paper - PP201 - is sized at 130x180mm, or 5x7". It's a bit bigger than the rather measly standard snapshot size that you'd have at one time got back from a high street film developers. It has a highly glossy finish, and is quite nicely weighted at 260g/m^2. Canon give it a 5 star rating but don't really explain what that means. It is of course fully ChromaLife100 compatible, and the recommendation is that you leave prints to fully dry for 24hrs once printed.
I use the paper with a
Canon PIXMA iP4700 colour printer. I ONLY use original Canon inks, and I ONLY use papers for which a compatible ICC profile is available. For most Canon printers the ICC profile you would select for this specific paper is one of GL1, GL2, or GL3 (with 1 being the highest quality print, 3 the lowest).
Ensuring original inks and papers are used means that you print what you see on the screen. Assuming of course that your monitor is properly calibrated - if you have no idea what any of this means or why it is important for photo printing, then google "colour management print work-flow", or read the slightly outdated but still relevant
Color Management for Photographers (also reviewed).
For showing off great photos I use Canon's A4 sized Pro II paper, but for printing off snaps for friends and making triptychs, the 5x7" Pro Glossy II is ideal. Very pleased with this product and I certainly won't go cheaper!