Currently I am buying rolls of dimes. I am putting together a 1965-present set for my two nephews. I find all of the the dimes to complete two sets and then mix them up with a number of others to let them search the bag and find the sets on their own. They like it and it doesn't cost much. Hopefully they will get interested in coins when they get older. There are always a few that are hard to find in any descent condition so sometimes I have to search a lot longer that one would think.