Glassdoor claims $12/hr, but Glassdoor famously shows really low numbers and doesn't have any accuracy checks. I don't trust their numbers at all.
But even $12 at the 50 hour/week claims that everyone makes for Amazon would be $34K.
But look at Glassdoor, the same people claiming $12/hr are also claiming $3K in cash bonuses, $1K+ in tips (warehouse tips? something is fishy with that site) and other big incentives.
US Dept of Labor says that the median is $13.50.