Unfortunately, the sources provided do not offer information on the best online deal for Advil.

DrugPatentWatch [1] is a website that provides information on drug patents, including Advil's patent status and expiration date. Advil's website [2] offers information on their products, including Advil's different formulations and recommended dosages. Harvard Health Publishing [3] provides information on safer alternatives to nonsteroidal anti-inflammatory drugs (NSAIDs) like Advil for people with heart disease or at risk for it.

However, none of these sources provide information on the best online deal for Advil. To find the best deal, it may be helpful to compare prices from different online retailers or pharmacies. It's also important to ensure that any online retailer or pharmacy is reputable and licensed to sell medication. Consumers should be cautious of deals that seem too good to be true, as they may be selling counterfeit or expired medication.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/ADVIL
[2] https://www.advil.com/
[3] https://www.health.harvard.edu/heart-health/heart-safer-nsaid-alternatives