Value Garage (indoor) or Value Park (outdoor). Yes it's more expensive than the third-party options but there's no waiting for crowded shuttles that can often run on irregular schedules. Or they can be so busy that one has to wait for multiple shuttles before getting on one.

Take the Terminal Link train which runs every 8 minutes at the worst and has plenty of space.

Cost is around $130-$150 for a week, sign up for an account to keep an eye out for discount codes that come often in email.

Convenience > Cost.