Cheap rubber floor mats for the rear

Been looking for a gray rubber runner that goes across the entire back floor, and I have not been able to find anything that is both long and wide enough to cover the whole area. At the end I realized that a generic front side rubber mat that's 17 inches wide fits perfectly. I put the two mats on sideways and the entire floor's covered. Take a look:



These floor mats are 8.88 at Walmart and I think any generic floor mats will do the job. I use a zip tie to string the two ends together, though I don't think it's really necessary.

Still hoping that Nissan would make the OEM mats in gray.