Here is an applique tractor for .99 at
http://lynniepinnie.com/shop/embr...
Not sure if she has a minimum purchase amount though.
some here too.
I did the one from brother usa, it is green and old fashioned style about 3+ inches wide and tall. My grandson was with me[while embroidering] and chose to have it blue and it looks great. Good digitizing too. Find another on www.embroiderydesigns.com - type in the search box.
a free one here
I have also done this one, it looks great too, but I remember that I made mine a bit smaller and it broke a needle [it got too dense, because of resizing] It is smaller that the one on brother usa site.