If the site you're playing at doesn't have it then try somewhere like Planet, but places don't like posting paint (if you can't collect) because it is so fragile.
Usually £25 for tomahawk paint from the NQ off Markie (great man ) but depends how many boxes you want - shops usually give you team deals for 5 or more boxes
thats not all they have got, they have training paints and deals but you have to give them a call. the ones they have on the website are tourny grade paints.