What I am finding interesting is that there always seems to be one seller that floods the market with their MISB sets. It is very difficult [as a potential seller] to gauge when to put items on the auction block. For those of us who do not have cases of the theme pieces, waiting for the right time is more or less a crap shoot. The minute you put your set up and there are, at that time, no others like it, within 12 hours 3 more of the same pop up! I think this is true for most of the "highly collectible" themes. I have a 5300 MISB that I am willing to part with but I definitely want to get as much as I can for it... Knowing the last one went for $660 tells me that people are looking for it now and have the disposable income on hand! Will the availability go up or down as we approach the holidays...and just how high will it go??? Sometimes a crystal ball would be a good thing to own. Maybe I can find one on ebay!!!!!