Yes I found a bunch. Here is a link to the Etsy search https://www.etsy.com/search?q=tshirt mockup you will find hundreds there of all styles and colors. I dont want to link to any specific one, but you will see a whole selection and can choose the ones best for you. They are paid ones but they are literally a few dollars and if you set it to cheapest first you will find lots for under a dollar. I cant be bothered to go searching for free ones when they are this cheap.