hi im trying to get this to work but i get this error 

[Vehicle Vendor Options] Price adjustment unexpectedly failed for price config (response: 'buyminicopter', player: 76561############).

i try to use economics

and it also says at vendor that i never have innough money 

I will look into it.

Merged post

I just tested and was unable to reproduce the issue you described.

I added a price entry to buy the minicopter for 250 economics, granted myself the permission for that price override, then purchased the minicopter for that amount. My Economics balance was initially 264, and ended at 14. After that, it said I could not afford subsequent purchases as expected.

I found a way that error can be encountered, which is if you are using Backpacks in gather mode. I will fix it soon.