Does anyone have any experience or ideas with shipping a set of four carpeted car floor mats? I'm trying to figure out a way to do so that won't cost and arm and a leg. All the flat rate USPS boxes appear to be too small. Based on my measurements, with no folding or rolling, I would need a box that measures 26 in long x 18 in wide x 2 in high. I suppose a higher (but less long or wide) box could accommodate the mats with some light rolling of the mats. Thanks for any ideas anyone might have!