"Even though Amazon is up a great deal, you will get a chance to buy it," the "Mad Money" host said.
He predicted that Amazon, which traded up nearly 2.4% early Friday, could come down later in the day, asApple did on Thursday when it opened up 2% after blowout quarterly results but closed basically flat.
By Friday afternoon, Amazon was up less than 1%. Amazon shares have soared nearly 15% in a month.
"They will be down at one point and you can go buy them. And you should buy them," Cramer said.
"These companies are for the ages. It's kind of like we've got a major league and we've got a minor league. And the major league there aren't that many teams in it," Cramer said Friday on "Squawk on the Street."