If they are indeed unavailable, you will get your refund as soon as the order is cancelled. I usually get the refund before the cancellation email when things are unavailable from them.
Well.. They *were* true a few months back, but I think they were just trying to clear them out. I bought 10 sets of pads, 5 at a time at $0.47/set back in both March and April. I know several other people who ordered a few sets each around the same time period.. but I guess we bought them all up between then and now.