Thought I'd pass this along to anyone wanting a extra large mouse pad cheap.
I had been using a 14" x 10" Razer Goliathus mouse pad with a logitech mx518 mouse.
The width was fine but 10" just wasn't quite tall enough and I found myself sliding off the bottom.
I also have just recently upgraded from a Wacom Graphire 3 small tablet to an Intous 4 small tablet which I have mounted on a custom built fold away stand, which covers the mouse pad when folded down.
Thought about buying a larger gaming pad, but prices are just too expensive and one day while talking with my mother (who's a quilter) she suggested I try one of her teflon pressing sheets.
This thing is 18" x 20" and my mouse just glides along just as smooth as can be, plus when I've got my Intous folded down there's still plenty of room to move my mouse.
Got it mounted to my desk with binder clips (though you could use tape or whatever to lock it down).
You can find these sheets as small as 16" x 16" for under $10 online or check out a local quilt shop.