See NASDAQ's official listing ( http://www.nasdaq.com/symbol/amzn/after-hours ). Several other ticker symbols (AAPL, MSFT, etc.) are also affected.
Edit: It appears several tech stocks (AAPL, MSFT, AMZN, etc.) have their prices set to 123.47. Definitely pointing to some sort of data corruption.
Which is what you'd get if the price was 123.456789... and rounded to two decimal places.
If you go to schwab.com and get a quote there, it shows the correct prices, so it wasn't the exchange itself.
US Market closed early today at 1:00PM. Market data was finalized at 5:16 PM. Data sent to third parties after 5:16PM today would have been test data - they do this every day and the third party systems receive and then purge the test data. One or more third parties took at as real data, possibly because of the odd market close time, and then re-propagated those prices to the real time systems. The reason this can happen is that certain off book transactions can be/are reported by these third parties. These reports update the stock price.
Why Amazon.com, Inc. (AMZN) Stock Will Not Falter Anytime Soon Investorplace.com - 7 hours ago
Hilarious