Dreams Unlimited Travel offers some okay deals on tickets with Mears transportation from Disney.
http://www.dreamsunlimitedtravel.com/universal/
We've used this and thought it wass pretty convenient. A rental car would be faster since you wouldn't have to wait on the shuttle.
A non-advertised perk of the
Dreams Unlimited tickets w/ transfers is that you can get early entry to IoA. Since it's not an advertised perk it's not guaranteed that you'll get but we did in March and there have been several reports of this working. An extra hour in the morning in HP is huge!