I have no idea what’s available in reprint form these days, but you can always read it the way I originally read Caniff’s TERRY AND THE PIRATES and early STEVE CANYON, back when there were very few reprints of that.
I found the nearest local library with a good microfilm collection of old newspapers, and read the strips as they appeared in the Boston Herald. It was a fascinating reading experience, since it preserved suspense (for the amount of time it took to scroll from one day’s paper to the next and find the comics section), and the process of finding each strip (check front page for index, scroll through and slow down when movie/theater ads pop up) meant I saw a lot of headlines and advertisements, which gave me an ongoing historical context for the strips.
So if you find out what local newspaper TARZAN ran in, you can probably find it that way. It’s not fast, but it’s rewarding. And certainly affordable.