The Entertainment books come out in late August. Some public jurisdictions (i.e. bookstores, etc.) only put them on sale beginning Novemeber 1 of every year (regulations).

If you buy your Entertainment books through a charity (which you should whenever possible as you do support the charity) then you could get your hands on them in September.

I go through this exercise every year and for the past 5 years, this is how it worked.

I both sell them and buy a case for my own personal use.