Yeah I have the same thing, except you can't buy it from morebeer because they're out of stock on frickin everything. So I got mine from midwest:
http://www.midwestsupplies.com/products/ProdByID.aspx?ProdID=4123
When you get it it'll have an annoying piece of tape and label on it you'll have to remove with goo-gone or goof off or something. See, what'll happen is you'll come home after a rough day of baby sitting ingrates (Working in IT) and the puppy will take a leak on the floor right in front of you, and then you'll get your new false bottom out of the shipping box only to discover the labels they put on there won't be removed with acetone or mineral spirits, the sticky is atomic-grade. So save yourself some grief and get some goo-gone now before you order the false bottom.
Oh, and that false bottom works GREAT with the cooler.