It could all be legit. I ordered a part from an online co. back in July. It was a Kuryaken part, and they said it was on backorder, and K does a run of a part and then doesn't make more for some unknown number of months.
I've written twice, and both times got a quick answer saying it was still backordered, and thanks for my patience.
I've checked with a bunch of other parts companies, and they're all out of stock on this part, so I'm assuming that nobody really has it right now.
You could check other places and see if they have it ready to ship. That would give you a better idea about if you're being scammed.