Mechanics Creeper - $16 - Costco!
Just came back from Costco (Canberra), and I noticed they have mechanics creepers for $16!!
Now the link I have posted is the same 'style' as the costco ones. They are 4 wheeled, black, and for $16 is a great price.
No more dirty backs working on the concrete, and when the hot chicks walk up to your car and ask you what your doing, you can slide out in style.