Did some googling _ on acetic acid and pickling vinegars _ and came up with this source for 20% vinegar _ used as an environmentally friendly herbicde _ to spray on and kill weeds.

Available for retail purchase at Garden-Ville stores in Texas, or through their online stores:

http://www.garden-ville.com/d/4429829_36600.htm

$13.19 a gallon _ but don't know about the shipping charge.

Ohm