Depends. Maximum Fun makes their shows freely available, but has donation levels like NPR based on what you can afford with premiums for donors.
Howl.fm, on the other hand, is 4.99/month for just the archives.
Honestly, I think the Best Show should follow something closer to the Maximum Fun model - maybe add some other shows with some friends of the show (maybe put Cherry Blossom Clinic as a Best Show network show?) and it will be easier to afford to keep doing the show.
Either way, I will pay a donation or something to keep the show going.