How do you purchase VR games?

Can you elaborate on the process of acquiring virtual reality games? I'm curious to know if there are specific platforms or marketplaces where one can typically find and buy VR games. Additionally, I'm interested in understanding if there are any compatibility issues I should be aware of before making a purchase, such as ensuring that the game is compatible with my VR headset. Lastly, are there any tips or best practices you could recommend for finding the best deals on VR games?