Lexan can usually be found at Home Depot or Lowes. It's more expensive than plexi, but it's a much better material and will prove itself much more durable over time. And if you're just using it for a small thing like the doors/front, you don't need much of it. It's far easier to work with than plexi as it doesn't crack and split like plexi does. You can cut it with a regular circular saw, table saw, chop saw, etc. Price and strength will vary depending on thickness. And the thickness needed will depend on the application.