Audio cape for Beaglebone Black: hard to find

I am looking into BeagleRT. I have a Beaglebone Black already. I need to get the Audio Cape for the BBB.
I’m finding that the audio cape seems to be hard to find. Most places say that they are out of stock and don’t know when they’ll get them.
There are some places that have it, but the prices seem to be exorbitant.
Does anyone have a lead on where to get one reasonably soon, and by only giving up an arm or a leg, but not both?