A Uyuni agency whose entire published contact is a WhatsApp number and an Instagram handle — no street, no email. That is normal in this town and it is worth knowing before you try to walk into their office.
They sell the salt flat and the three-day Lagunas route through the Eduardo Avaroa reserve to the Chilean border, which is the trip the town exists for.
They publish no street address, so the pin here is the town centre.