Well, I checked my Amazon order, and it's still listed at $10.99. Perhaps it was a limited online pre-sale special.
Just checked mine. Same; $10.99 Maybe it was a special pre-order deal but I wonder if it was a typo/mistake in data entry, etc. That would be my guess since it jumped up to a more normal price range in a day's time.
This helps "ease the pain" when I recently delayed clicking another buy button for 3 CBS/P sets that were very good bargains I don't see those CBS/P sets discounted too often online.