I got mine from Amazon and it was the wedge shaped one that has a small pillow for in between your legs too however, I just didn’t like it felt I was walking so much more so ended up using my normal pillow as they are quite flat as a little bit of support.
I got mine out of TKMax, I can't remember the brand but I know it was in a blue cover, it cost me £14.99, it was a lifesaver for my back