Don't forget it will have to be rolled as well.
Gardeners quotes always sound expensive, but if they are professional people with a good record, they're as entitled as any tradesman to a decent fee for their time, machinery etc. Suppose it's a bit like painters - we feel it's something we could do almost as well ourselves, that makes hiring a tradesman seem expensive.
Anyway, always worth getting at least 2 quotes. I'm not in your area so can't help with names, but good luck.