I got mine this morning at FYE. They had just one copy of it, so if you plan on getting yours at an FYE store, you'd be well-advised to call first. Just as spmahn said, they're also charging the full list price for it, so if you're looking for a bargain, FYE's not the place to get it.
I watched "Bad Influence" and "Promises, Promises" just a few minutes ago. I watched "Bad Influence" with the commentary and I really enjoyed it. It's very informative and interesting. I especially liked hearing about all of the crazy demands and restrictions CBS put on the show. It seems like they were really anal about it being insanely kid friendly. The thing about how Al wasn't allowed to use the bit about drowing in a drinking fountain in one of the educational films really got me. I can't believe CBS actually thought that kids would be afraid of drowning in a drinking fountain!

I do hope that the rest of the commentaries talk more about the show itself instead of talking about what CBS wouldn't let them do, though. It's awesome to see these episodes looking so good, and they sound great too.
Oh by the way, I've cracked the code.