Prime Day is Amazon's yearly promotion of its subscription service, which has many perks.  Those perks include exclusive deals, free 2-day shipping on many products, and access to streaming services.  This year, it starts at midnight (PT) on July 11-12. The yearly Prime Day promotion is the perfect time to sign up for Prime if you're not already.  It's also a great day to get some fantastic deals on cool products.  New members even get a 30-day free trial.…