Bay Area, California with Prime, receiving Monday.
This is not unusual to find mega savings on amazon like that, brand new, shipped and sold by amazon.
I have previously bought multiple items that were $600 typical average price, but due to amazon price matching or lightning sales I was able to get the items for $380-$500. Also Samsung 128GB uSD cards that were $70 typical would be $36. FYI, I only buy from Amazon directly, unless the item is not generally sold by Amazon and it does not make sense to manufacture knock offs for the item, then it's OK to order from 3rd party sellers.
If you want to buy something and it's big ticket, and you absolutely must NOT need it tomorrow, look at the keepa chrome extension price history, see if it's the lowest price in the last year, if not set a new price depending on price volatility of the item and what kind of savings you'd like and wait. Eventually you'll save anywhere from 5-30% on the price.