Not to pimp out any HAMBers... you can get it on eBay from many places, including Walmart and even the Gibbs brand's home site on the web.
When I bought the Gibbs for my p/u I tried a couple of local dealers but found it was just the same price to buy direct from the manufacturer since none of the so called dealers stocked it gallon containers and they wanted to charge the same for shipping as did the manufacturer.
yes , place a order afew days ago , not to may places stocking items on shelf now days , sign of online ordering only to come & tax Man wants his cut