AMZN is a steal!
They obviously have a variety of different businesses. And as they are still investing heavily in growth you are not seeing the results on the bottomline.
You'd need to value each component to get to a valuation.
As a shortcut I've always thought it made sense to look at EV/gross profit as they do a lot of their investing through their PNL below the gross profit line.
I believe Bill Miller has mentioned this as well.
AMZN hasn't been this cheap (on EV/gross profit) since early 2015 before they broke out AWS in their financials. They are a powerhouse today compared to 2015. And do a lot more high margin business (AWS, Ads, 3rd party, subscription) today.
There was a period in 2014-2015 when it traded at these levels we are seeing now. Then you have to get all the way back to 2009.