Good quality olive oil can fit any food budget. Your local grocery store, discount stores, or online sources offer reasonable prices.
Keep in mind three tips as you shop for olive oil. First, look for a dark bottle or a can. Light breaks down oil and decreases shelf life. Buy a size that fits your usage needs.
Second, choose extra virgin olive oil for the highest quality.
Third, look for a best-by date. Once the container is opened, air will impact shelf life. Use within 30-60 days.
If you store olive oil on the countertop, use a dark bottle to minimize exposure to light.
Source: https://medinsteadofmeds.com/tips-and-tools/olive-oil-buying-guide/