Xur only has 3 locations that he rotates between weekly despite the addition of multiple locations going back from Forsaken. Furthermore, he currently has a permanent location within his treasure hoard. Just open his inventory weekly from that location to include selling his usual exotics and legendaries.
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I have a feeling he’d end up like the Nimbus bounty and just not want to refresh weekly. Or somebody would get to spend 2 of their exotic cyphers in one week and he’ll never change inventory after that. Bungie is adept at breaking things, but I’d be curious to see it