Here's a supremely easy craft that will allow you to DIY your own road sections for Car Wars and Gaslands. If you don't already have some of the necessary tools and hardboard, it's not as cheap as desired, but I already had some of the materials to create them so I went with it. Whether you go with the not-quite-as-cheap-as-hoped cardboard, or with the fancier neoprene depends largely what you already have available.
Neoprene Road Tiles - https://amzn.to/3pvLGBb
Road Tape (4 inch) - https://amzn.to/31xZp2o
Road Tape (2 inch) - https://amzn.to/3DtM6Nl
12x12 Hardboard - https://amzn.to/31yRzFo
Glue Dots - https://amzn.to/3dpQMJF