The majority of my modest collection (~30) of pipes were bought from eBay. Advantages: (1) you can potentially spend a fraction of what you would on a new pipe (2) you get a nice pipe already broken in - if not actually broken! (3} you get to learn/practice your pipe restoration and cleaning skills (4) in the process of evaluating what you would get for your money, you will be forced to research pipe makes and types and so learn a great deal about pipe history. Disadvantages: (1) you must be very careful with your shopping, lest you get a busted up piece of junk photographed from a flattering angle (2) your "new" pipe will be old/used and will almost certainly need to be cleaned before use, although I have a friend who never does this on his new acquisitions and suffers no ill effects.