Hey There---you're too close to your departure date to order online, but there are LOTS of stores that sell them, not sure of your location, but a lot of sporting goods stores sell them as well as places like "Dillards" which is a department store in our area and where I got ours.
To be honest, I don't like mine. I got the open toed, heel strap version, and the DH got the flip flop type. We just got back from HHI and my feet blistered, pretty badly, in about a 1.5 mile walk (WDW=about 15 miles per day) while the DH walked the same distance w/o getting blisters, but said that he wouldn't wear them to WDW.
You will get six and 1/2 dozen answers as to who LOVES them and who HATES them---my best advice is to buy them if you think you'll like them, but have a back up plan of a shoe that you KNOW you like for WDW.
I will probably wear my
crocs again, but NEVER will I wear them when there is heavy duty walking, especially, when hot and humid temps are involved.
The best thing I've ever had on my feet at WDW were Nike tennis shoes, your pick, and a pair of Hanes socks, our first trip, I wore gold toe socks and had blisters EVERYWHERE! I think the ticket is SOFT, none thready socks and by ALL means, when you get back to your resort for a mid/late day break, take the socks and tennie pumps OFF, let those puppies breath!!!!!
Good luck!