I made my own - but I did not want that funny little swing open door. I wanted a full size, 2' x 3' front door. Doesn't add to the strength of the cage like the mini door does, but I can slide a plan in or out without trouble.
Only bad thing is it makes it hard to place the cage in a drain of sorts - door has to swing open, so if it's in a tray, it don't open... doh.