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Gum contouring can be performed for either esthetic or functional purposes e.g. crown lengthening, pocket reduction, and regenerative procedures. There are also different modes of gum contouring treatment e.g. by laser or scalpel with or without the need to remove bone surrounding the tooth.
The prices for the different modes of treatment would be different. Also your insurance and Medisave may be able to cover gum contouring procedures that are performed for functional purposes.
As such, it is really hard for me to tell you which clinic is affordable exactly as I do not have their relative prices for the different treatment modalities.
However you can possibly find the cheapest treatment in Singapore with the post graduates at National University Hospital which would set you back around $400 (before Medisave, if claimable).
Thus you might be able to take that as a benchmark for your cost considerations at the other clinics of choice.
Hope this helps.