Scripts that add your desired size to cart, take you all the way to the final checkout page, and autofill cc info for [specific website].Scripts that are contained in .zip files. These scripts interact with websites via the Tampermonkey extension (available from the Chrome store for free). You will extract the files to your desktop, add to Tampermonkey via the options page, make the necessary changes (e.g. size, billing info used during autofill, etc.), and save. After that you can do your shopping.