That would have to be on the striper him/herself on the price.
I have a lady I have known almost 25 years do our stripes on the Cadillacs at work. Looks like factory painted stripes instead of me masking them out and spraying the color.

I think she charges around 30-50 a side to stripe. depends on if they are 1 color or 2 color stripes too .

Surely you have a Sign painter close to you ,these guys are good with a brush. Might give them a try.
Never know till you ask