Amazon has the Travelpro Platinum Elite Hardside Expandable Spinner Wheel Luggage TSA Lock Hard Shell Polycarbonate 21-inch carry-on Suitcase on sale:
Vintage Grey $227.53: https://www.amazon.com/gp/product…=UTF8
True Navy Blue $237.93: https://www.amazon.com/gp/product…=UTF8
I bought these in October when they were a front page deal for $204.40. I just travelled with them internationally, this size is allowed for cabin carry-on. They worked out very well, so I’m buying another one. See the old thread discussion here: