Are there any post 1964 nickels that are valuable?

Answer 1

No, and most pre-1964 Jefferson nickels aren't especially valuable either. Contrary to popular misunderstanding, 1964 nickels were not made of silver - they're struck in the same 25% nickel / 75% copper alloy used for almost all nickels since the coin was introduced in 1866.

Dates to look for include 1950-D, war nickels (more below), and 1938 and 1939.

"War nickels" are the only silver US nickels ever minted. They were struck from late 1942 through 1945 using an alloy of 56% copper, 35% silver, and 9% manganese because nickel metal was needed for the war effort. War nickels can be identified by a large mint mark letter over the dome of Monticello on the back.

Answer 2

There were 2 billion nickels dated 1964, and they're all worth five cents.