Harris 30% Concentrated Vinegar, Multi-Purpose Use for Home and Outdoor, 1 Gallon

I was happy to find 30% vinegar at this price point and with free delivery ! We use it as a weed killer in the driveway cracks and stubborn weeds in the yard. Sometimes I use it straight , undiluted, from a spray bottle. Depending on the stubbornness of the weed, sometimes I mix in a tablespoon of commercial-grade orange oil (limonene). A 16 oz bottle of that will last for years and is very potent booster for natural weed killing. When mixed with the vinegar, it sticks to the leaves longer. This is a very effective non-toxic weed killer, and pets won't go near it due to the smell.

Walmart has the overall best price for this product as well as it being relatively difficult to find anywhere. It generally will occasionally be out of stock although recently another brand of similar price and quality was introduced to my local Walmart, so thankfully I can purchase when needed.