Window kit are available like so:

Henkel 00-09123 Duck 84-by-120-Inch Shrink Film Patio Door Kit
Feature: ... Indoor patio door/large window kit contains everything you need to insulate one standard 2 panel patio door; Crystal clear film heat shrinks to seal out drafts and cold; Contains 84-by-120-inch crystal clear film, one roll 1/2-by-432-inch doublesided tape and six alcohol surface wipes; For indoor use on painted or varnished wood, aluminum, vinyl ...more
Customer Reviews — [1] Rating: 4 Date: 2008-01-07 Summary: Easy to install; product works like a charm ... I didn't really see how this would possibly work, but we were cold and could feel the draft coming in through the window. After a painless installation process (we followed the instructions to a T), we're rather pleased with the results. The draft is definitely gone! ...more
[2] Rating: 5 Date: 2008-11-09 Summary: love it... ... All my windows are non-standard sizes. This over size patio length allows me to cut down to the size I need with out having to tape two of the standard size plastic together. I do wish Amazon had this in the warehouse earlier than NOV. I live in Chicago and needed the plastic by mid OCT. The price is much better than buying it at the hardware store. It works great to cut down on drafts. ...more

Frost King V73/3H 42x62 Window Insulation Kit 3 Pak for Indoor Use
Feature: ... Thermwell #V73/3H 3PK 42x62 Wind Kit; THERMWELL ...more
Customer Reviews — [1] Rating: 5 Date: 2006-11-06 Summary: Good buy, good plastic, good tape!!! ... So far, I like this brand the best of the three brands I have used over the years. Good price number one, with ample tape, and 3 separate sheets of plastic for each window. I had enough to actually do 4 windows in my house. Recommended so far, lets see if they stay sealed the whole winter. ...more
[2] Rating: 5 Date: 2008-11-10 Summary: Used this for years ... Have used this product for years and it works great. I have awning windows which have a second sheet of glass over the pane but it's such a poor seal that they are really single pane windows. If I don't use this plastic the windows frost and sweat horribly all winter which destroy the sash and frame. These keep the window frost free all winter - no moisture problems. Make sure the 2 way tape is tight, no gaps. Make sure you get the plastic down with no overlaps. Put a small half inch piece of scotch tape over the curtain ...more
Editorial Reviews — ... Product Description | 3 Pack, 42" x 62" Shrink Window Kit, For Standard Size Windows....more

Frost King V73/9H 42x62 Window Insulation Kit 9 Pak
Feature: ... Thermwell #V73/9H 9PK 42x62 Clear Wind Kit; THERMWELL ...more
Customer Reviews —
Editorial Reviews — ... Product Description | 9 Pack, 42" x 62", Clear With Tape, Shrink Window Kit For Standard Size Windows....more

3M 2174W Outdoor Patio Door Insulator Kit with Tape Dispenser
Feature: ... Reduces heating costs and saves energy; Stops cold drafts, helps prevent frost build-up and reduces condensation; Performs like an extra storm window; Shrinks tight for wrinkle-free, clear-as-glass results; Increases R-value by 90% over an average single pane window. ...more
Customer Reviews — [1] Rating: 5 Date: 2007-11-21 Summary: Hard for me to find locally ... The local stores seem to only carry interior film kits. I found two that had "Brand X" exterior film. In my opinion, 3M is the quality product and worth looking for. The cost of my purchase including shipping was equivalent to what it would have cost locally if it had been stocked. I have used this 3M kit for many years to seal over the sliding screen portion of my patio door. I have a dog door panel next to the screen door and the film allows me to keep the dog door open most of the day without letting in too much ...more
[2] Rating: 5 Date: 2007-01-11 Summary: Great product ... This Patio door insulation kit is a great deal....easy installation. Was able to reposition product to assure a tight fit. Will use again. ...more
[3] Rating: 5 Date: 2006-11-06 Summary: More pricey, but better tape pays off ... I bought this brand last year, got them on sale so it was a little more competative to other brands (like frost king). Let me tell you, it's all about the tape. My older house has very touch paint to stick to, and this handeled all but one window reasonably well, needed minor re-tapes throughout the season. Worth the extra money if you want minimal hassel. Again, the multiple kit is one big sheet to cut to size, but there is ample tape to go around. Hope you save a few cents like I did during the cold of winter. ...more
Editorial Reviews — ... Product Description | Imagine how much heat is lost through the small cracks and crevices in the door and window frames around the house. On top of that there is the cold air that is exchanged for that heat! During the cold winter months it is a good idea to insulate the doors and windows to cut down on your heating bill and eliminate extra drafts. For exterior use Includes 1/2" x 13.8-yards of tape Does one 6'8" x 9' area Clear as a glass Keeps out drafts...more

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