How much for a seat bolster repair

[Vince70]

I wonder if anyone could give me an idea of cost for a seat repair on the drivers seat base on my Audi.
I have managed to get the material and the seat is in perfect condition apart from the drivers side lower bolster which has started to fray and has gone a bit flat but it's only gone on one panel.
I was going to strip the seat down and take the base of the seat to an upholsterer, but was just wondering if anyone has an idea of cost as the car is not worth a great deal of money.