I just found out that Optimum Cable is providing free previews for HBO and Cinemax. Unfortunately, today, 9/10/22-Saturday, is the last day. Sorry, I found out late - it's been going on since 9/6 or 9/7. Maybe you'll get to watch a couple movies today (or record some). Other cable providers might be doing the same so you may want to check yours.
Not sure how I missed this one. The free preview started on September 6th too.