One of the websites with the best and reliable and best offers is Vip-urcdkey, where the prices they have stand out, especially in the Microsoft operating system, both the current version and the previous one, both for the Pro and Home versions . And also, with the exclusive GD20 code, you get an additional 30% discount to be able to enjoy lifetime licenses. Or what is the same, you pay once and forget about problems. You only need to enter the GD20 code before making the payment, to obtain the additional discount of the 30% compared to the highlighted prices：

• Microsoft Windows 10 Pro OEM CD-KEY GLOBAL | 13.90USD--(after 30% discount GD20)
• Microsoft Windows 10 Home OEM CD-KEY GLOBAL | 12.94USD--(after 30% discount GD20)
• Microsoft Windows 11 Pro OEM CD-KEY GLOBAL | 19.98USD--(after 30% discount GD20)
• Office2016 Professional Plus CD Key Global | $25.89--(after 30% discount GD20) 
• Office2019 Professional Plus CD Key Global | 45.70USD--(after 30% discount GD20) 
• Office2021 Professional Plus CD-KEY GLOBAL | 55.92USD--(after 30% discount GD20)