More important to ask: why?
Buying fake likes is against Facebook's terms of service and can get your account shut down. It's a very, very
Anyone -- anyone
-- who tells you they can help you "get away with it" or that it's OK because "everyone is doing it" or that they've got some sort of special "undetectable" system or that they have an agreement with Facebook that their
phony paid-for likes won't be penalized... that person is a liar and a cheat and a scammer. You should not trust them at all, much less give them any money.
If you aren't earning as many likes on your own as you would like, you need to work in improving your Facebook presence, not trying to fake it through buying phony "likes."