It depends on the brand and size of the knife. If your looking to find the cheapest prices you can check online and browse around till you find what your looking for. Or you can just go to your store and see what fits your needs.
Yes, messermister is a popular brand of chief knife cases. Also, shun profession is another popular one. great deal. They are durable, sleek and very useful.
You can buy chef knife cases at many online merchants and cooking stores. Most retail stores have online sales - try looking warehouse stores and cooking stores.
Yes, target does sell cheap chef knife cases. On their website they can compare prices to other department stores for you. Compared to most department stores the knife cases are cheap.