They've pretty much ended that due to over-attendance. Their grove can only handle so many interested people and interest in annonas has been surging as of late. Additionally fluctuations in weather have caused recent crops to be marginal at best, and difficult for anyone without a greenhouse to produce with any consistency.
There aren't a whole lot of commercial operations specializing in annona, and if they are, they probably have a few varieties instead of a large number.
You can see if you have a local CRFG chapter willing to put one on.