From Dave Graffam Models
ZIP File – $5.95 USD
This is a 48" x 48" playmat designed for 1:64 scale diecast cars and 20mm-25mm wargames when printed at full size. It's compatible with Gaslands as a multi-use combat-racing track, including worn-down paint lines across the track that can be used to indicate starting positions, gates, and finish lines. A sneaky shortcut in the "southeast" corner of the map can be used as a pit road during long races, and you'll find other features that you can use to set up a variety of treacherous routes.
This mat is offered as a 150dpi JPG file, which should be easy for any print shop to accept and work with.
The full playmat measures 49" x 49", which includes a 0.5" bleed on each side.