To get a fairly accurate cost you need to make a technical task (or fill in the development brief), but the approximate prices are as follows:
1. Landing page = $300+ details and examples,
2. Business card site up to 10 pages = $500+ details and examples,
3. Corporate site = $700+ details and examples,
4. Online store "under the filling" = $700+ A "turnkey" $1000+ details and examples;