No one that I know of sells the "original" window foil anymore. There is some that is being sold that is made of aluminum, but it really doesn't do the job. It's too thick and you can't "work" it the way the original could. It might be OK for repair but it's real shinny and thick. I haven't used it, but once seeing a roll of it ...... I just wouldn't use it.
Fortunately, I was lucky enough to buy a supply of the original before the Brooklyn Foil company went out of business. It's sitting in my freezer, hopefully preserving the adhesive back. I use it for repair and when a plate glass store front window has to be replaced and they don't want to go for the glass breaks. I don't understand because it cost just as much to refoil ....... but hey ....... thas hokay wit me.
The other thing I don't understand is .... you can still buy foil blocks ...... what for?
It's lost art now.