If you own a Philishave Coolskin shaver, you are sooner or later going to need refills of the lotion cartridges. These come in a standard pack of five and at this price are very good value.
I find that typically one cartridge lasts a good few weeks if you shave every day, and you get a new cartridge head with every pack, so not much clogging up in the shaver either.
The Coolskin is a great shaver, and to get the most out of it make sure you keep stocked up on these as they really help the skin whilst making shaving a smoother, more comfortable experience.