If your looking for an old blue mailbox souvenir you can probably find one on online. But if you are trying to install one on your street for use it won't work. US postal carriers have a certain route they follow and will not deviate from their specified route.
Go to GovDeals or GovLiquadations or you could try to go to a larger post office that is also a Mail Distribution Shop often they have them just laying in the back of the building and you may luck out.
They have much better transportation now.
I'm not exactly sure, but I'm sure someone in any local Pist Office could answer that question.
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