There is one big problem with that link. The list does not include all providers, only those that want to be listed. Last year I changed oil providers based on the prices shown on the list. Shortly after changing, I noticed my old provider dropped from the list, and about six months later the new provider dropped off. So I asked about it. They said that as the price of fuel rose, they saw more churn in their customers as people shopped for best price. So they stopped publishing their price. You can get it by calling them, but that's more work than looking at one web page.