I visited a local hardware store today and bough popcorn and diet soda... not typical hardware store purchases. But today's Brain Game IS about something you'd likely buy at a hardware store. Try this one on for size:
You visit a local hardware store for a particular purchase. The clerk tells you that 6 would be $1.50 and that 12 will cost you $3, but adds that he'd be happy to sell you 9680 for only $6. What is it that you're buying?
See the answer here.
Answer: House address numbers. They sell for $1.50 each, so they're probably the stick-on type.