For me, anything free is a prize. When I was growing up, there were not a lot of competitions open to me outside of the class spelling bee, and prizes mostly consisted of a pat on the back and an "atta girl," which any kid will tell you is not much of a prize.
Summer trips to the beach meant prizes, though. There were seashells, there on the ground, and you could pick them up and take them home for free, and nobody would care except my mother, who would protest if they were at all smelly.
Now, things are much different. Free stuff is everywhere. It comes in the mail, it is piled up outside businesses, left on the curb on trash day and given away at schools. All that residue is either trash or potential art supplies, depending on your point of view.
This drawing is an example of such a prize. It was a free text book from Los Gatos High School, and in its former existence had been part of a copy of Arthur Miller's Death of a Salesman.
Sometimes, it is really nice to have new art supplies, and good ones. However, don't overlook the possibilities that the jetsam and flotsam of modern living sends your way. Prizes await in the oddest of places.