MercadoLibre

MercadoLibre was founded in Argentina in 1999 and is one of the largest e-commerce platforms in Latin America, with its own sites in countries such as Mexico, Chile, Colombia, Peru and Uruguay; in Brazil it operates as Mercado Livre. Its catalog mixes official brand stores, professional shops and private sellers, with new and used goods, mostly at fixed prices. Payments go through Mercado Pago, which provides buyer protection, and much of the shipping is handled by Mercado Envíos, its logistics service.

Its sheer size makes it a key hunting ground for collectors in the region, with trading cards, comics, coins and stamps, retro consoles and games, and vintage objects. Each country's site has its own catalog and currency, from the Argentine or Mexican peso to the Brazilian real, with listings in Spanish or, in Brazil, Portuguese. Built-in shipping serves buyers within each country, and many sellers do not ship abroad, so this is worth checking first.