I'm in the same situation. The buggers, they even emailed me beforehand to say that my payment had to be made (when it was ready to ship) and that the item I'd ordered was reserved for me quoting the whole package with Mellotron Heart, signed booklet etc, but I didn't get them. That is what I paid for so I'm going to email them about that. I ordered the set early on so was sure I'd get everything.
Anyway if they had sold out of them they should have mentioned that ont he website, it is not simply a case of getting more business, it is false advertisement and I'm sure technically illegal, or something.
The only thing saving my annoyance over this is that Watershed is a masterpiece and I'm seeing them on Sunday. So now I have a vinyl and spare cd of watershed. I expect to see a load of these end up on ebay. I'm pretty sure I'm not the only one who bought this for Mellotron Heart, the signed booklet and the Poster.....ah well, at least I got that.