Well, the puzzle was not behind that paywall until earlier this week. I emailed WSJ support and they confirmed that the paywall was in place:
>Non-subscribers are able to view and access past editions crosswords and puzzles, however the current editions puzzle is available only for subscribers.
>Though you may subscribe to gain access to the puzzle on the same day.
I wrote back suggesting that they offer a puzzle-only subscription option, like the NY Times. I'm happy to pay the NY Times $40 a year (and AV Club, Crossynergy, C&R, and Elizabeth Gorski $25 each), but $360/year for a full digital subscription at the Journal would be too much.
Thanks for the links! The last one isn't to today's puzzle, so I guess it's the latest of the archive puzzles they said they're making available to the public.