Okay, so I finally got around to calling them. Spoke with (ah, what the heck, I will put her most of name) "Helg", I was obviously not the first one she has talked to about this problem but was certainly reading from a script. I got many "this was an overwhelming response" "you just gotta keep trying" and the best one "I know it shows the band but the message about it can't complete the order means the band is not in stock" in other words, She said the order error meant that the band was no longer there. Did not matter if you logged off, logged back in, and it still showed the band, it was not in stock. She told me there was nothing she could do, and yes I had her check my account to make sure there was nothing wrong. She said it could be that I had a debit card linked to my account!?!? That doesn't make sense, regardless, we deleted it (since I planned to anyway because of the whole $100 hold).
So my long (probably ill-comunicated) message is to say, according to ah..... Helg, that when you get the "cannot complete your order at this time" even though the band is showing, the message means the band is not available. But have no fear, just keep checking (and continuing to be frustrated at our oversight and ill-planning of this offer.)