Does O'Reilly learning have non O'Reilly books as well? And do you still have the coupons system that Safari did, that allowed you to download entire books? $50

Does O'Reilly learning have non O'Reilly books as well? And do you still have the coupons system that Safari did, that allowed you to download entire books? $500 is a bit high but may still be worth it for me if these are available.