Head out to Tractor Supply, buy a section of what they call horse matting. Comes in different thicknesses, 4' wide by how ever long you want. Glue on a rubber, paint a power line and your ready to pitch. Somewhere in the $50 range.
https://www.tractorsupply.com/tsc/p...er-3-8-in-thick-sold-by-the-foot?cm_vc=-10005
I went there and the one here only has 4x6 mats, they didn't have any option to cut to a larger size. I looked at the turf at Home Depot and it's not cheap. I just got a gift card for Amazon so I'm just going to put that towards a pitching mat.