As no-one else has commented here I might
on High Pressure Air UK they sell combo deals, that's where I got my kit from.
I have the balystic HPR800C reg
balystic 48ci 3000psi tank
and a generic woven line that they supply too
The combo deal I'm talking about includes all of this and is £140 but you also have to factor in the cost of the engine and other upgrades and donor gun (if you are doing a custom) about £600. Or get an MTW or some other prebuilt HPA gun