What do you call the "box" that muddy/wet shoes are put in?

Question

It's a "box" or something similar that holds the dirt from muddy/wet shoes so the dirt don't get all over the floor after you take your shoes off at the front door.
Also where would I buy one?

Answer 1

How about a boot tray, you can pick them up at hardware stores and here is a website that has one
http://www.home-garden-supply-catalog.com/Boot_Tray_Or_Plant_Tray.html

Answer 2

I call it the milk crate