Really depend on the current tire condition and much you are willing to part with. Tubes are the cheapest route.
As for tires you need to decide first the thread pattern. For me the RIB thread is the cheapest in a 4 ply tubeless.
Then there is the flat free tires which are a pain to install. Requires a cone, a good hydraulic press, a hydraulic jack, silicone lube, and at least 8 inches of spacers. Plus you might need new bearings. How do I know this? It because I mounted two of these back in August. And they can be expensive. I charged 131.58 each with new bearings.
Now removing the old flat free was the real challenge. They are bear to cut off.