I bought an Xbox one at target yesterday using the baby registry and red card. The in store coupon does not say it will not work with electronics so tge customer service rep just over rode the system and gave me the 15% off. Also you can get the 90$ assassin's creed syndicate limited edition...
Not sure on your main question but if you sign up for a college registry you get a 15% off coupon about 2 days after signing up for anything in your registry online. and if you hook up a target debit red card to your normal account you will get an extra 5% off. So 20% off the 1tb is $82 or so...