From Heaven Hill:

Good news:
Rittenhouse Rye is growing in popularity.

Bad news:
Rittenhouse Rye is growing in popularity.

If you're one of the increasing number of fans of Rittenhouse Straight Rye Whisky, you can enjoy taking a little blame for the spirit's relatively short supply. There's been a resurgence in the popularity of Rye Whiskey in recent years and Rittenhouse, and several of the older, more established American Straight Rye brands, have been scrambling to keep up with the demand.

The good news is that there are a significant number of barrels of perfectly aged Rye that have just come available, so it won't be long before you'll start seeing better supplies of it at your favorite bars and spirits retailers. This should ultimately improve stocks of Rittenhouse Bottled-in-Bond.