check out
www.teamrdx.co.uk
for sale section
not all air bottles fit all regs eg the gov air is different
if you have a flatline or geddon then most bottles will fit these
i good place to buy them is from planet
www.paintballplanet.co.uk
there arnt cheap
the cheapest set up i think will set you back about 160 thats for a 1.1 lufur and fixed output mellee regulator these work fine untill you want to start changing output pressure etc then you really need to look at the flatline geddon or maxiflow or ever angel air.
the cheapest one of these is the maxiflow i think
4500psi reg
www.smartparteurope.co.uk
there on there you can then select which bottle you want on it depending on your budget
allternatively get a secound hand one with a bottle thats still in test
hope this helps
steven RDX