Boy Scouts and Popcorn

My cousin, who's 12, is a boy scout or something of a similar ilk.  He's selling popcorn to raise money.  I, being uninformed about said popcorn prices, said I would buy some.  However, it's 40 dollars for 2 gallons of popcorn.  2 gallons are the normal size for popcorn tins, which normally I would price at 20 dollars or less.  I guess I thought that it would be like girl scout cookies, which I can afford.  I'm not sure I can afford a 40 dollar tin of popcorn.  Can I not buy it and still be a decent person?