I had to order it via the web. I've been using the tube that I have open for well over a year. A little goes a long way.
I really like the way it leaves a 'slick surface' on the plastics. Also, I believe that it stays on very well. It's certainly powerful enough.
I bought three tubes (discount at buying 3), and could have easily done with just one. One of the things I like, is that I can very easily just put it in my pants/shorts pocket, and apply it very quickly when needed. Since it's a 'gel' like consistency, it gets pretty 'stiff' when cold, and certainly much more plyable when hot.
Even though I thought KNB was very good, I believe that Megastrike lasts longer, and it's certainly not as messy. After applying it (fingers), I then take the small amount of residue on my hands and rub it all over. I figure it helps mask the human scent, to some degree.
Tex