This page will include the following: how to access minecraft including how to get it on pc/mac,xbox and android.It will tell you how much it cost for each one.
You can buy minecraft for either PC or mac on the minecraft website: www.minecraft.net you have to create a free account so you can buy the game for £17.95.
If you want to you can log into the minecraft website and you could buy a gift code for minecraft to give to someone as a gift or present and they can use it on the minecraft website to get the full game.
If you have an xbox 360 you can buy minecraft on the xbox 360 for 1,600 microsoft points what is the equivalent of £13.60.
You can get minecraft-pocket edition on your android and iOS devices for £4.99.