Need leather arm bands for Grell Sutcliff costume. Where can you buy armbands like the bartenders used to wear?

You can order leather armbands from online craft stores such as etsy.com.

If you prefer to search for armbands in person, department stores that have a crafts or sewing section would be a good starting point. Try Michaels, Hobby Lobby, Joanns, or Jo-Ann Fabrics.