i have been calling and rechecking the prices that are listed on the transportation sticky from UO to WDW on the UO forums.
As far as I have been informed, the info is current on that site.
I try to update when others post with costs they had.
with that, i call the companies to verify that info.
but, info can change anytime.
listing what is current on the website on the darkside forums:
for mears shuttle :
2. Book a ride with Mears shuttle
Mears runs shuttles from the Disney hotels to Universal and back. You will need to make arrangements 24 hours prior though. Prices are $34 each person RT. You can check out the website for more information:
www.mearstransportation.com
Can I book my attraction transportation online?
No, you will need to call them 24 hours in advance at (407) 423-5566, that is unless you are already using them for transportation to and from the airport then you can book the attraction portion online at the same time.
currently the prices i have received for taxis range from $35 to $40 one way.
time in the cab will add to the costs
many that visit the UO parks for the day will walk to a deluxe hotel and have them call a cab for them to return to disney.
free service provided by hotels, you do not have to be an onsite guest to do this.
many times there are cabs waiting at the hotels for a fare to take.
uber, i think you have already read on the uber transportation site how those fares can go.
some at UO will rent a car from the deluxe hotels for the day and drive to disney.
they return the car once they return back to UO at the car center desk in the hotels.
private car service runs $50 one way or $100 rt.
there are some companies that have a rt at $85.
if you want cheap, go with Mears shuttle.
it will take you longer as it will pick up others at disney resorts at times, but it is cheaper than all others than uber.
hope you find the information you are seeking.