If you don’t have a print at home option just save the JPEG files to your computer and upload them onto a site like walgreens.com to print them online. They are specifically formatted to fit into an 8×10 inch frame. If you want to and know you you are certainly welcome to change the size although printing quality my be reduced at sizes larger than 8×10
Definitely an idea but less time consuming to do just one or the other. Also I'm thinking of the confusion for the customer. From what I see some digital download shop owners will offer physical prints but they do it as a "blank" store item customers can buy and then reference the image they want printed so I might do that. Do you sell digital downloads or physical prints?