How are you getting to Universal from the airport? if a taxi, you might want to price out car service for both legs of your trip. Most car services offer a grocery stop. Price likely comparable to what you'd pay for cab service. However, prices vary widely among the competition, you need to shop around & check reviews from what my friends tell me. We usually do a split trip between WDW & Universal but having a vehicle is worth the expense to me. There are threads here on the transportation board by month that will let you find codes/coupons to get an idea of the cost. Alamo and National are easy to return to the BW area. Not sure if you could hotwire or priceline with a drop to a different location, you'd have to check. You will pay $20 per night to park at the Universal resorts. However, they are among the few Orlando non-WDW deluxe resorts that don't impose a resort fee.