Sites like CDKeys or G2A sell Microsoft keys at discounted prices. These are not Microsoft-authorized resellers, and many keys sold on these platforms violate Microsoft's license terms. Keys can be revoked at any time.
You can find substantially lower prices from authorized third-party retailers. However, always verify the seller's reputation before purchasing. Look for sellers who provide a 25-character product key without requiring remote access to your computer to "install" the activation. solidsquad activator windows 11 work