I think zen reefs might sell one as well. I do have the avast one and it works well. Honestly though, when I take pics I just tend to use my phone instead of my dslr. So my avast isn't getting as much love.
Aye I have the phone adapter but unless you zoom in a decent amount you will get a black circle outline with your phone based pics due to the length of the porthole. Just an fyi.