I was never told of any standard floor mats either.
I just went to kmart and picked up a set of motorpro heavy duty rubber floor mats. The passenger one fits as if it was factory and the drivers side is pretty close. Has a lip so will do a nice job keeping the mud / sand / etc contained. The rear ones are a bit of a waste of time... $29.95 kmart here has %25 off auto parts so $22.00 or so.
Drivers:
Passenger:
$22.00, Im happy.