I went to Southeastern Salvage the other day and found they had a large selection of floor mats for vehicles on sale for $4 a set. They had some really nice ones and I happened to pick up a set for my Frontier that were Nissan OEM winter slush mats that say Frontier on them.
They had some other brands like Versa, Maxima, Tundra, Xterra, Random Jeep and some universal mats. They also had stacks of universal SUV rear mats for $4 each as well, each stack was a different interior color. Not sure what all they have still in stock, but it might be worth stoping by. Seems like most were for Nissans.
I just thought I'd share since it was such a great deal.