https://www.gamespot.com/articles/destiny-2-xur-location-guide-where-is-xur-and-what/1100-6453679/

Destiny 2's enigmatic merchant Xur has once again appeared in-game, bringing with him a selection of weapons and armor that Hunters, Warlocks, and Titans can use to marginally improve their performance in the great battle against the almighty power level cap.

This week ya boy Xur has landed on Io, and if you open your map you'll see him lurking in the top left corner of Giant's Scar. Although it's pretty easy to get to his general location, he's actually tucked away inside a little cave, so keep an eye open for the entrance. Here's what he's selling this week: