That's a very unhelpful link if you want to buy or comparison shop. Online walmart sells over 300 different styles of countdown timer, including ones shaped like a tomato. Note that the Pomadoro Technique recommends a timer that ticks or makes some other unobtrusive sound to remind you that you are in focus mode, and to associate the sound with focus.
I tend to like quiet visual timers, though.
Something like:
https://i5.walmartimages.com/asr/63f18bde-f179-4b8e-a32a-8e4...