Hi Ali, you can buy it in boots, it is about £2.50 and has recently been on a 3 for 2 offer. You find it where the dental stuff is. It's a smallish bottle but will last for awhile. I was so pleased to have it in hospital when I was nil by mouth. It has a minty taste and is very refreshing, I will carry it around in my handbag to frehen my mouth instead of gum or mints.
Hope this helps
Jo x