You are right. Just a few days ago, they still listed separately "original" products like the 510, 910, 300, 700, etc. Now that is all gone too.
Since their Map Store is still down, it remains to be seen if they have completely orphaned this segment of their customer base (and if they will extend it to all updates also).
Not a good way to treat their relatively loyal customer base, as this may only encourage more people to switch rather then go down the same road again.
PS - UK site still shows them and still offers accessories.