If you have an O'reilly auto parts store in your area, check for this stuff, if they don't have it in stock they can order it shipped from their distribution center. Use the store part number because the counter monkeys probably have never heard of it: http://www.oreillyauto.com/site/c/de...0444&ppt=C0207. They also have the lower melt-point, lighter tack version: http://www.oreillyauto.com/site/c/de...0444&ppt=C0207
I know they aren't nationwide, so check other stores like NAPA : http://www.napaonline.com/Catalog/Ca...615_0006384006
It's available, you just have to find a parts store or transmission overhaul shop and use your charm. Or, you can pay through the nose for it from Amazon.
There are many other brands as well, including TransJel and Dynatex.
Gear