I had a look on ebay yesterday, and most of the pieces being sold were too small to cover one complete side of my 150qt. and since (I think) you got a 120qt, scott, they're probably too small for yours too, assuming that's what you want to do.
of course, larger pieces may come up for auction, but then you've got higher shipping costs to consider, too.
I think what randy did with bargain humidors is a great idea, though...to just order a liner set for you cooler, and give them dimensions a couple inches too large, so you can cut it down exactly to your liking.
only $30 or $40 that way.