so which is it,
spray tanning or airbrushing, there is a difference and that is why airbrushing costs more.
and do you plan to undercut the price of everyone in your area that offers spray and/or
airbrush .
adding this service to your current business could be profitable, but look at it like this, what if every salon in town knew exactly what you were paying for your swimwear, started selling the same ones and undercut your prices.
example:
your suit $100, your tan $25
other salon suit $50, other salon tan $50
do you see the point. If you would like to offer this service, follow the going rate within a few dollars and make money. getting cut throat on pricing can come back to bite you in the ***.