There are several options. Sometimes, you can check subscription-based services like Hulu or HBO Max. Also, some free streaming sites might have it, but be cautious as their legality can be questionable.
Well, you could check out Vudu or iTunes. They sometimes have the movies you're looking for. Also, some local cable providers offer on-demand services with romance movies. Just browse through and see what's available.
You could try looking on Disney+, as they sometimes have classic movies like A Christmas Story. Another possibility is to search on cable TV on-demand services. But keep in mind that licensing agreements can change, so what's available might change over time.