Who sells the cheapest powder coating powder? I normally use electrostaticmagic site to buy from.

Cheap is not always the best mate.. Depends upon where you are using it. I buy mine from PCS Powders and also Cromadex. They do an awesome Gloss and Matt Black which is loads better than PCS. Paramount Powders also offer good powders.
Metalic powder again its worth paying a little more, plus the end result can depend upon what clear powder is put on top.
What colour are you looking at buying?
What amount do you buy because some people only sell by the box, this being 20Kg..

Im after about 1kg of gloss white

u2u sent..