PS4 Pro is on sale for $349, but if you add any game/console/gear to the trade-in menu (even if you didn't purchase it from Amazon), you'll get an instant $50 rebate at checkout (on top of whatever you get from the trade-in).

I put in a $1 game and still got the rebate. A pretty awesome last-minute deal for the Holidays, since it qualifies for Prime shipping!

Also goes well with a year of PS+ for $40.