Looks like there is a way around the fee at least for the Santana. This is from the Santana website:
How do you find a Test Ride Center? Phone Santana at (800) 334-6136 x.5 and ask for a referral. This way you’ll know the location, phone number, and the name of the shop’s tandem expert. Best of all, callling Santana first ensures that your Test Ride will be free!