Yesterday I finally got around to sealing windows since I'm on vacation this week. I use the Frost King shrink plastic with the double side adhesive roll of tape. They work great
Been using them for 20 years. Lets see... roughly 10 windows per year, that's 200 windows I've done
I'm pretty dam good at it now too!! No really, they booger up the window frame a little but its covered by a curtain anyways..
I did 7 windows and the sliding glass door in the bedroom. I probably spend $30 on tape and window kits. Best $30 I could spend towards winter comfort