Ah... mentioning Universal Studios in your first post had me automatically thinking of the California one by accident. I never thought to check each one if they had an online store.
And it is worth noting for anyone visiting any of the other Universal Parks, there can be some different merchandise at each one (and some that is only found at one Park).

It means that Bumblebee is indeed fairly new, as Orlando was the last one I was at just 4 months ago, and they didn't have it at that time.
As such, if it is REALLY new, it could appear on the website later.