Oils are chosen by use first. A frying oil must take high heat without smoking, whereas extra virgin olive oil loses its aroma as soon as it gets hot.
For daily cooking and deep frying, soybean and sunflower oil stay the cheapest per litre and handle repeated cooking well. Extra virgin olive oil belongs in cold dressings and gentle cooking, where its taste actually shows.
Large drums bring the price per litre down noticeably. Every listing shows that per-litre price so a one-litre bottle and a twenty-litre drum can be compared properly.