The Contest Kid and The Big Prize (original title: Hawkins) by Barbara Brooks Wallace, 3rd Scholastic paperback printing, TX3987, 1978, 144 pages. Illustrated by Gloria Kamen.
DESCRIPTION:“‘Oh boy! Oh boy! A free thing!’ said Harvey- who never misses a contest- is reading the paper he just found on the sidewalk.
‘What’s the free thing?’ asks his friend, Woody.
‘I don’t know. That part’s torn off. But I’m going to fill out this form and send it in anyway.
But when the big prize arrives, not even the Contest Kid can believe his eyes.” (from the back cover)