Hello AnimatedG! Tight budget? That was my case; I turned to the used one. Chromatic button? I don't know them, I play the piano accordion. There are plenty of bargains in the used ones on the internet. But unless you try it and inspect it yourself, you really don't know what you are buying. I tried a few at an accordion shop in Quebec City until he offered me one whose sound I liked. He made it more expensive than the same accordion on ebay, but with a 3 months warranty. At a price equivalent to 12% of the price of the same new accordion, I really don't feel deprived that it is not the latest fashion. The important thing is what I do with it and that makes me happy. I think your best chances are in the small instrument stores or in the classified ads for accordion lessons and sales. Good luck!