There is a free service called Tinderizer[1], which sends web page to kindle using a bookmarklet. It works by opening the web page in a browser, apply readability javascript code, convert to PDF and emails to your kindle email address. All of this done in backend in a very few seconds. It will automatically appear in your kindle shortly after that. It won't work properly for subscription sites as it takes snapshot of the non logged in user. I have used this service for nearly a decade until Amazon decided to close my account.