Garage sale staple: Books
Let’s be honest, you won’t find a million dollars’ worth of first edition books or any rare books at a garage sale. However, that doesn’t mean that you can’t end up scooping up any valuable books that people might not know about, and you could definitely sell them for a profit later (since most books at garage sales are just a few bucks).
The key to managing to bring in a profit from these is to not only make sure that the book is in great condition, but that it is also a first edition of that book. If you somehow end up with it being signed by the author, you have hit the jackpot! For example, a first edition of Harry Potter and the Sorcerer’s Stone has recently been sold for $80,000!