Here is the previous thread I refered to
http://www.oople.com/forums/showthread.php?t=162773
The post approx half wy down where someone gives an ebay reference number is still valid and the kits are £40 all in. I have the exact one and it is ok, but prefers thinner paint ( I.e. Fascolor or createx water based that has been let down with water. I'm told the best consistency is approx that of milk, while the paint is more like cream in its supplied state.
I must admit I've upgraded the compressor to one with a tank and a variable pressure, but the one in the kit worked ok for simple stuff.
My compressor now far exceeds my painting ability