Well ...I'm not sure that's an actual regulator. My guess is that it's basically an on/off valve with a needle valve built into it.
But that's a moot point, because the thread isn't North American. Meaning, it won't fit on any standard or paintball cylinder found in the US. However, if the OP is actually in Mauritius, I have no advice to give.
I can completely appreciate trying to find the cheapest option around, but you'll save yourselves a lot of trouble by just looking through the options talked about on this site. Virtually every form of CO2 injection in existence has been explored and shared here ...thoroughly.
If you want a really cheap regulator rig, go with an Aquatek. If you want a simple ASA on/off valve option with a paintball cylinder, you can buy a set from somebody here, or put one together yourself for <$60. Then there are multiple steps upward on each of the regulator, solenoid, and needle valve, if you'd like to spend a bit more money.