The Galaxy has never been so vast and full of wonders! The Stellaris Expansion Subscription is a great way to experience the ultimate Space Grand Strategy experience with unlimited access to all additional content.
Just buy the DLCs (if you want them) when they go on sale. You can use sites like https://isthereanydeal.com/ to help you get particularly good deals on them too.
Works every time and after playing just about all of the modern paradox games, you really don't need the dlcs unless you're really into the base game and even then the time to learn means most of it won't even be within your grasp until you're like 50 to 100 hours in.