Making Stress Balls

M and A made stress balls to sell at a homeschool market.  They had separate stalls: M also sold raffle tickets for a bag of Lego Technics and had a few lucky dips.  A sold the stress balls and lucky dips.  For some reason, although she sold her stress balls for one dollar each and M sold his for fifty cents, A sold most of her batch well before M sold his.  They used flour and two balloons to make each stress ball.