Yep, Krystie, it was free. Baby items are free (with a limit of 2 or 3 items, I think - don't know for sure as I only had the one item), so it shouldn't matter what type of pram you have. They will take port-a-cots and car seats, so I wouldn't think your pram would be much heavier than those.
The staff were absolutely brilliant, I have to say. Even when I missed the shuttle out to Avalon and got there after check-in had closed, they still put the stroller on the plane for me and they were super helpful when I was soooooo flustered and upset! Can't give them a big enough thumbs-up.
Hope your staff are just as lovely as mine were!