A website SolarLeaks dot net is selling the data stolen from the companies, suffered from the SolarWinds breach, the attack that was likely conducted by a Russian state-sponsored hacking group with the goal of stealing valuable data from the victims.
The website claims to sell the stolen data from Microsoft, Cisco, FireEye, and SolarWinds. All of those companies are confirmed to have been breached during the attack.
The example of the data that SolarLeaks claims to sell is Microsoft source code and repositories. The cost for those is 600,000$.