Travel Technology - Best way to recharge an AT&T GoPhone?

Sorry, kind of a simplistic question but I only use a non-Sim'ed Blackberry on a CDMA network...

We picked up a cheap AT&T Go Phone at Walmart in Las Vegas last year that came with a sim card and free minutes. Saved on the roaming fees if I used my own BB.

We're heading to Orlando this year and was looking for advice on how to best add minutes to our AT&T GoPhone (so we can make the odd call home or be available to field an emergency call).

The original plan was to rent a car and, as a side trip, stop by an AT&T store to figure it out. However, it's now looking like we're not going to rent a car. I suspect the only commercial areas we'll hit are: MCO airport, around our hotel in Lake Buena Vista, WDW, and Premium Outlet. I'm bringing my laptop and the hotel has free Internet access.

Do you think I will I be able to just pick up a refill card say at a store in MCO (the directory doesn't seem to list specific stores but lists: Airport Wireless, Phones, Phone Cards) and apply it to the phone via the Internet once I get to the hotel? I'm guessing I'd be assigned a new telephone number (which doesn't really matter to me)?

TIA.

http://www.wireless.att.com/cell-phone-service/go-phones/index.jsp

You can also try walmart.com http://www.walmart.com/search/search-ng.do?search_query=phone+cards&search_constraint=0&tc=0&ic=48_0&ref=+500500.4294295980&tab_value=29_All

Any of the major stores such as Walmart, Taget, Bestbuy, etc., will have topups.

Any of the major stores such as Walmart, Taget, Bestbuy, etc., will have topups.

As will most convenience stores: 7-11, etc.

You might have to pay to reactivate the phone though. I'm not sure how that works, but ebay probably has activation kits.