Fiddleback, I didn't see the 1oz. tube at Walmart either. I bought mine at an Albertson's grocery pharmacy baby stuff department. The toothpaste tubes work great too.

Another option...simply spoon a glob of the stuff into a zip-lock baggie, film capsule, pill bottle, etc. and dig out a dab with a stick. Smear it on the cotton and burn the stick too.
I hate getting Vaseline on my fingers when camping...ick.