Bouncebacks are offered multiple times per year, but I cannot say how regularly. Typically you'd find a card or flyer in your room a couple of days before checking out that will give the offer. THe most popular bounceback is, of course, when "Free Dining" is the deal. Other deals I've seen have been a reduced room rate (like 20 or 30% less than the normal rack rate) or to add extra features to your MYW base ticket at no extra charge. Only you would know if the offer is really worth it to you - but they are definitely an enticing thing to consider. I believe it's marketing genius, to offer you something that must be accepted before you leave, to bring you back once again later in the year or next year - while you are still in that Disney-high. No matter the deal, though, they all come with fine print - so if you get one, make sure you read it and understand it fully.