Im buying a bike of my mate a mongoose bmx, for 30 quid but it has no breaks, how much would you say a full break system is and on average for a bike place to fit it?

Im buying a bike of my mate a mongoose bmx, for 30 quid but it has no breaks, how much would you say a full break system is and on average for a bike place to fit it?
To be honest - If it has no brakes - You would be better off buying a new bmx coz Bmx's aren't that expensive and Braking Systems can be quite expensive and not easily found unless you contact a dealer of parts..
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