One method is buying from a country whose currency is weaker and selling them to other countries where the currency is stronger. That looks legit but is not. MAK keys are used to activate a specific number of devices. The count is pre-configured as a deal between Microsoft and Enterprise. Such keys are bought it the bulk and then sold cheaply online.
Details This will require fresh installation of Windows This is not an upgrade key. In order to successfully activate the system, you should create Windows 10 installation media first. Retail key means you can transfer it to another PC when you are buying or building new PC in future. Download Windows 10 Pro: