An antique store is the best resource in locating a pocket watch. As obvious as it may sound, this is the ultimate resource, however, there are a large number of people that overlook this option when searching for a pocket watch. If you can find an antique store that specializes in jewelry, it will make the chances of you finding that perfect pocket watch that much greater.
An alternative to an antique store is a flea market. There are many bargains available at flea markets and if you find a great flea market, you may just find a great pocket watch for a great price. Not only could you end up saving money, but you could find the pocket watch you have been looking for.
If you did not have any luck at the antique store or flea market, another place to locate pocket watches is at a garage sale. Garage sales are very "hit or miss", but if you do happen to find a pocket watch, you can get it for fractions of what it may cost at an antique store. This is the cheapest way to find a great pocket watch, however, it may take longer to find what you are after.
These are just a few places you can begin your search for the perfect pocket watch. Be sure to shop around and compare the prices between vendors. Sometimes you could even get them to knock off a few bucks if you mention that you saw one at another shop that you were interested in. With the resurgance of antiques and pocket watches in general, chances are that you can easily find the one you are looking for at a great price.