I got my P3 Standard for $499 with Free Shipping from ADORAMA on thanksgiving morning, using a slick deals promo code.
The standard and Advanced share almost all features, they both share:
same camera
same gimbal
same body (Standard has the new shell as well, most early P3 advanced don't)
same motors
same battery
same 720P display resolution
upgrading firmware over wifi , is actually better with the standard
Same DJI GO app
Standard has longer flight times
Standard does not have Glonass ( I get 9 or 10 satelittes without ever losing GPS)
Standard does not have VPS ---I don't think that I would ever use it.
Standard does not have lightbridge, which is a Plus for the advanced
Advanced has a better Controller as well
Advanced has longer range which is a plus --But I have flown out to 2400 feet from home, several times I 'm happy with that
I would rather be disappointed with a $500 purchase , than a $1000 purchase.
Also, when DJI unveils the Phantom 4 in a few months, I'll have another $500 in my pocket for the upgrade.
I am extremely happy with my Standard, as I has exceeded my expectations
In my opinion, The advanced overall is a better bird, but not a better deal.