The price of a new magnetron varies depending on the make and model of your microwave. As a rough estimate though, you can expect to pay around $40-60 for the replacement part. Amazon has a good selection of magnetrons for the most common brands, but make sure you do your homework first so you buy the right part for your own appliance. (Heads up! If you click on a product link and make a purchase, I may receive a commission at no extra cost to you. I never recommend a product I wouldn’t use in my own kitchen, and this helps keep the site running. Thank you.)