We used MH Transportation from BWV to Univeral when we went. We also use the same service from the airport. They are very good....I think I paid $50 round trip.
The Lynx bus is time-consuming and requires a transfer - after first getting to a location on Disney property (either the TTC or the PI/Westside stop at Downtown Disney, I think) where you can board the first bus. See www.golynx.com for routing and pricing information.
Mears offers a shuttle from your resort to Universal for about $16-$18 per person round trip - so if you have three or more people, a town car service would be cheaper, even with the tip. Mears needs to be reserved at least a day in advance; just dial "0" on your room phone and ask to be connected to Mears.