We bought ours at Home Depot, but had to pay to install them as it wasn't as easy as the brochure made it look. Of course, once installed, it took about 10 min for our cats to figure out they could escape through the bottom, so we pretty much never get to use them unless we lock up the cats. :( As far as "snapping", we could fix the one side to be stationary and then just open the other side. We really like them when we can use them. I called the manufacturer, and they said they were never intended to be used as pet screen.

I did this cheap & easy with raw netting & velcro, and I've been very pleased with it. It works fine if you don't go through the doors much. Cost well under $100. 1. I bought raw mosquito netting (from mosquitocurtains.com). 2. Cut it to fit across both doors, allowing extra width to fold edges under for neat appearance, & of course some overlap onto the door frame where the velcro would be. 3. Attached 1" velcro patches, 3 across the top and about 4 down each side. (I stapled one side of the velcro onto the curtains with an ordinary stapler - 2 staples on each. Super quick. Nailed their mates to the door frame (eek!) with 3 small nails. Doorframe, curtains & velcro are all white, and it looks surprisingly neat and nice. (I could even white-out the nail heads!) Still, in winter I'll probably take it down, leaving just a few inconspicuous little velcro patches.

Hi I have a phantom door, I have a french door in my kitchen that opens to a covered patio so I was unable to use a conventional screen/storm door. I got my door at Lowes, it was about $300.00 a little expensive but it works great. It's good if you have pets or children, if the door is pushed off it's track you just close it and it realigns itself. We've had it for 2 years and are very happy.

Decent quality sliding - or folding sliding doors - will do the job and last more than 15 years. Of course you have to fit them properly for a good seal so choose an experienced fitter, a specialist fitter or buy a door that can be fitted by the manufacturer. As with anything, you get what you pay for. Untreated softwoods are likley to warp over time so treated woods, hardwoods or metal doors will perform well over a longer period.