You can't opt out of having a meter. If you've had one fitted and you decide within a certain time period ie 12 months that you don't want it, then you can opt out, but after that you have to stick with it. If you're in a property that already has one, you have to keep it.
Back to booster pumps; £300 from machine mart - model CBM240E is the best I think, as do many others. It takes my mains pressure into the RO from 1bar to 5bar, I use a 4x40. Fills my 650l tank in about 2 - 2.5 hours.