After watching the Japan Mint store site for months and seeing nothing, I finally relented and bought a 2019 Reiwa Mint Set from Ebay. I didn't pay too much, but I paid more than I would have paid on the Japan Mint website. So it goes. As I said on another thread, it appears that the outgoing Emperor's coins have historically had drastically lower mintages than the incoming Emperor's coins, so the "Heisei 31" is probably the one to have, but I haven't seen mintage figures yet. Here are some pictures of the Reiwa coins that were waiting for me at the post office today, complete with some closeups of my favorite part, the new era name.