Question I read 3 books when I was young(mid 50's) about 3(I think)brothers in Maine. One book had the word gold in it and the rest I don't remember. I want to buy these for my grandsons. Thanks
Answer I hope the series you are thinking about is the Hardy Boys because otherwise it is probably not in print any more.
The publishing world does not keep books that are not big sellers available for very long. Generally after 6 months, unless a book is popular, or an award winner, you can only find it in specialty stores and even then only occasionally.