Competitively advantaged businesses set to benefit from the rapid growth of massive markets can be excellent investments. This is particularly true if you can buy them when their share prices are temporarily depressed.These two elite growth stocks are on sale today, but they likely won't be for long.Growth stock to buy No. 1: Palantir TechnologiesThe artificial intelligence (AI) revolution is advancing at lightning speed. Forward-thinking investors are starting to look beyond the suppliers of semiconductors ...