What Is Ben Buying

Riddle: Ben walked into a hardware store and asked the price of some items. The salesman said: One costs $1, Eight costs $1, Seventeen cost $2, One hundred four costs $3 and One thousand seventy two costs $4. What was Ben buying?

Answer: Ben was buying home address numbers and they cost $1 per digit. Source: https://riddles.com/index.php/1532

Ben walked into a hardware store and asked the price of some items. The salesman said: One costs $1, Eight costs $1, Seventeen cost $2, One hundred four costs $3 and One thousand seventy two costs $4. What was Ben buying? — What is Ben Buying by Anonymous Riddle