Vinegar is sold in all major store, supermarkets, and even at convenient stores. I've even seen it sold at gas stations who offer food and other items for people in a hurry.
They do make cleaning products from vinegar, but they are rather expensive and not worth the investment. You can buy the cheapest bottle of white vinegar, in the market and make your own cleaning products at home. Plus white vinegar is great for killing fleas and ticks on animals.
Today people worry about the environment and have started to use white vinegar and baking soda to clean their entire home. This makes an excellent cleaner for your kitchen, bathroom, and floors. I'd suggest just picking up a gallon or two when you find it on sale. You can stock this in your home for several months. However, in warmer climates, once it is opened it can turn a funny smell and you might see small crud floating around inside the bottle or at the bottom of the bottle.