No I know for next year... beyond ridiculous. There is no reason that this should be the case.
There's every reason that's the case. They want to ship one box and pay one charge. Clearly they don't have one of your items so they can't ship it. Amazon does the same thing unless you select "ship items as soon as they are available" which they charge you extra for.
You have to make two separate orders, which most people think will put them further down the line so they don't do it.
Really in a perfect world none of us should buy anything ever from a carrier and just let Apple handle it all.