When we booked a fridge, we had to request it at check in. Have you checked out all the swaps on the budget boards? It could be a good way to get a free fridge.
I have twice requested a frig for medical reasons at POP. Each time I reminded them at checkin. 'No problem.' But each time I had to call mousekeeping to have it delivered. One time it took two calls. That was a little annoying but not a big deal.