There are several websites that allow individuals to watch vintage television commercials at no charge, such as BestOldCommercials.com and RetroJunk.Com. Classic commercials can also be viewed on the YouTube channel "VintageTVCommercials," which currently has more than 10,000 subscribers, as of April 2015.
BestOldCommercials.com is solely dedicated to bringing users the best retro advertising from the past half-century. Retro Junk is an online archive focusing on vintage television and movies, with an entire section dedicated to classic commercials. Both sites allow users to filter advertisements by decade.
YouTube user "VintageTVCommercials" operates a channel that includes popular playlists such as McDonald's commercials and toys from the 60s, 70s, and 80s.