RAY: A girl and her mother are out shopping. They overhear a conversation between a customer and a salesperson in the next aisle.

The customer asks, "How much does one cost?"

The salesperson answers, "One costs 99 cents."

"OK, how about 12?"

"Oh, that'll be $1.98."

"Okay, in that case, I'll take 128."

The cashier rings up the purchase, and it comes to $2.97.

Here's the question: what kind of store are they in, and what is this person buying?

[ Car Talk Puzzler ]