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Mercado Libre, eBay, and local secondhand resale sites are your best bet, though finding one in good condition is getting harder since those devices are pretty old by now and the batteries are usually worn out. Check the physical condition carefully, make sure the screen works properly, and test that there are no hardware issues before you buy.
The original iPhone 5 is pretty old by now, so you're going to have to look on second-hand platforms like Wallapop, Vibbo or eBay, though availability depends on your area. Make sure the seller shows clear photos of the device, check that it works properly (screen, buttons, battery) and ask for the serial number to verify it's not locked. You could also try physical stores that sell used phones in your city, though they usually have more limited stock and higher prices than online.
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