On Amazon where they’re offering this highly-rated
Summer Pop ‘n Sit Portable Indoor/Outdoor Booster Chair in Dusty Blue for only $25.50 shipped (regularly $34.99)!

This all-in-one activity floor seat and booster can be used both indoors and outdoors. It is compact with an innovative pop and folds design that makes it easy to pack up when you’re on the go. Plus, the detachable tray is BPA-free and dishwasher safe so you can use it when traveling while also knowing it is completely safe to use for feedings and easy to wash.
It also comes with a storage bag and has a back pocket for storing bibs, utensils, or even an activity book.