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If you have one nearby the most obvious choice is the post office. They have been selling stamps since stamps became a thing (see the history of stamps here) and they will be happy to help to make sure you have enough stamps for what you are sending. If you are one of the unlucky people who do not have a post office nearby however there are still a number of convenient options for you to choose from. For a more in depth look at Where to Buy Stamps. If you are looking for larger numbers of stamps (10+) then you have a lot more options. There are plenty of large chains across the country that stock postage stamps as well as envelopes etc.