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reseller marketplace arbitrage is one of my current hobbies. find things in one place, where you know demand exists in another. rely on seller/buyer not searching across marketplaces. not very lucrative, but satisfies my consumptionist/frugal/profiteering impulses. https://buffer-media-uploads.s3.amazonaws.com/5b7054bb04c2e7c9527f5faf/864359b90f00702711f948391c745db1e996a075_e7d31d329ea8fdfb9d1bbf14937dcbeb122f507e_twitter