Believe it or not, some of the thickest plastic cutting boards I’ve used are the ones I bought from Ikea. They come four to a pack and have multiple colors for you to color-code. I have some old ones that I don’t use as the top surface anymore but are great to create more cushioning when you are doing more serious chopping. These things have never curled or warped on me and they are well over 5+ years old. I don’t ever toss them in the dishwasher though.
