Pre-1965 quarters and dimes (AKA "junk silver") contain 90% silver. At the time of this posting, you can buy this $10 (40 count) roll of quarters for $365 (about 36x face value). One pre-1965 Washington quarter contains about 0.18084 troy oz. of silver. Which means 11 quarters contain about 2 oz. of silver. At current silver values, this is actually a TERRIBLE price, but it makes for a nice online visual.
Pre 1965 US mint silver coins. Maybe one of your best investments. Some of your savings should be stored in US minted silver change, available from coin dealers in various quantities, ie 100 oz silver or hundred dollar face value bags. Because of the recognition and denomination sizes (dimes, quarters and half dollars) they are better than 1 oz American Eagle Silver coins for your smaller day to day retail business transactions--should the need arise.