Hal, your hardware stores may be different, but in the USA, they don't usually carry electronic components. Use to get capacitors at Radio Shack however, I think they are not the part suppliers they use to be.
There are other electronic parts suppliers that do carry a full assortment. Do you have any friends or acquaintances who are into Ham radio? They might be able to help. Maybe fine a Ham operator in your city or town and ask for help.