hello mate, I just got myself a scorpion too and I'm in the same boat as you and didn't have a bottle, horrible aint it having a gun like that and not being able to practice with it. I asked around a few other forums and somebody put me onto a 7l bottle on gunst*r with a new test for £90. That should be getting delivered today.
Now I need somewhere to shoot, googled and found sandhall, emailed them but still waiting for a reply.
good luck with the gun mate, maybe see you at sandhall some day