I spend mine, making exact change whenever I can. My husband is one of those guys who always empties his pockets at night, and ends up with a big jar. We usually end up taking this coinage to the Coinstar machine and cashing out with $100-$200 bucks. Our Coinstar machine takes 10%, though, so I know how much we wasted. There are some that will dispense gift cards to Amazon, iTunes, etc.,and those don't take the 10%. Their website will tell you where you can find them, but there's none near us.
--Maria