Discount School Supply has many options.
Personally, I never preferred all-in-one type furniture since it seems harder to clean and maintain.
My go to's are stackable high chairs (Ikea) and my wood table I got off Amazon. I like wood since I can sand it if the marker/crayon marks aren't coming off with a magic eraser.
Plus, it looks nicer than plastic and... I live here.
Mats: I use sleep mats with blankets and pillows attached. I also bought on Amazon. Each child has their own and they wash really nice.
https://www.amazon.com/gp/product/B0...e?ie=UTF8&th=1