Any thoughts on the best options for those of us wanting one? It seems pretty much to be Pinephone or Librem 5, are there others? Both are preorder only. Anything generally available?
PinePhones have periodic batches, not sure if that's considered a pre-order exactly.
Check out the devices[0] list on the postmarketOS wiki to see which Android phones and other things have support. In general none of them will work as well as the PinePhone, because Pine isn't fighting this sort of thing the way most manufacturers are, but it could be a fun thing to look into if you own anything already supported. You could also port it to a device not yet on the list if you're up for it.