You can get those shower/dunny tents at pretty-well all camping stores. Rays, Kangaroo, Anaconda, BCF - they all have an equivalent. I've found that the zippers fall apart in no time (we've been through three of these pop-up tents) because of the way the bendy frame keeps the material too tight. You do up the door and the zipper is under huge stress. Otherwise they're OK.
The other type is the Coleman
Insta-Set Deluxe Shower/Toilet. It sets up with permanently attached articulated poles and pops up in around ten seconds. It's a little more expensive - but it is far better in winds and is larger.
Either way - they're all good!
