Also what do you want a kilt for, and how often will you be wearing it? They do vary somewhat.
Millitary ones- such as for a Pipe band- are a much heavier materiel, longer around and have a slightly longer drop.
Normal ones are just that, normal. 8 yard, 16 oz.
Dancers ones are often slightly lighter, as it's hot work, and collapsing from heat exaustion on stage is not good.
How often will you wear it?
If you're going to be working in a Scottish theme palace, and will have to wear it every day, then a proper heavy one is best. If you're just going to wear it occasionally, then a lighter one will do.
Costs- A standard, 8 yard, 16oz kilt will be about 300 pounds, and a full formal setup will be about 600.
A lighter 'tourist' kilt will be about 40, and an informal setup (jacobite shirt, no jacket) about 100