High pressure tank

Been offline for a couple of years. Just received my new TalonSS. I use a high pressure fiberglass tank (4500 psi) to provide me plenty of air on the road. Of course I don’t air the gun past it’s recommended levels.

Now my tank has a defective valve and needs hydrostatic testing. I’m thinking it will be less expensive to replace the tank and valve than to go through all I must with this older tank. Any suggestion on where to get a tank and valve?