[Mr V]

I believe that Home Depot sells the type of carpet used on the field. I believe they may stock it in grey at many locations.

For Regionals the carpet is discarded after every event. So for next year you may want to ask if it any of it is available from the event you are attending.

Here in the PNW district we try hard to make sure that we don't bring carpet back from its second use. So we will cut it up into halves, quarters or what ever teams want and depending of course on how many teams want some. Unfortunately 3 years in and many teams have already picked up some in previous years and demand is dropping off significantly.