How much does air brush makeup usually costs?

Air brush is definitely better than regular make up. Costing 20 - 50k for bridal.
If it's your wedding you can either opt for HD makeup or air brush. Both can give you your dream bridal look.
A good experienced MUA can suggest you one of these. And yes NOT every skin needs air brush. If your skin is beautiful already, HD makeup is sufficient and you can save some bucks.

I think it costs somewhere around 18/20-30k . It should usually lie within this budget! And yes I do think its better than regular makeup as if done by a good professional, it looks much moe seamless!