i just posted a similar question yesterday. didn't get much response, but i eventually found out from my guide the following info:
Aug + Sep UYs are definitely sold out.
Oct has only a few hundred points left, if not sold out.
Dec has around 2000 points left.
Feb + Mar have plenty (19k+) of points.
she didn't say about Apr + Jun, so i don't know the status of those 2 UYs.
she predicted that BWV will be sold out around the beginning of Aug.
hope this helps!
btw, if you find out any updated info, or if your guide gives you any different info, please reply back. thanks.