I can't find this adapter anywhere - I've checked multiple Apple Stores in southern california and can't find it online anywhere but the Apple Store. Either the salespeople on the phone don't know what I'm describing, I can't see it on the shelves, or it's just not around. Apple lists 2-3 months for delivery online - is that accurate?

I see multiple posts here and on the online Apple Store saying this thing is available in Apple Stores. Can anyone list where they've found it?

Thanks!