I got one of these and the door to match and mounted it in the wall next to my sliding glass door. It works great and seals real nice. If you install it yourself (and it really is simple if you have a sawsall and a drill) you will save hundreds over the other options. Plus my neighbor has one just like your picture and they hate it because it has a weighted bottom that goes fwap fwap pretty loud every time a dog goes through. They have three noisy ass beagles so they deserve it, but either way the one in my link is really quiet.