Crossword Genius

Where an Illinois-shaped cornflake sold for $1,350 (4)

Ross

I believe the answer is:

ebay

(Other definitions for ebay that I've seen before include "Online market" , "Modern marketplace" , "Internet sales facility" , "Auction site" , "Website" .)

I've seen this clue in the Universal.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.