No block off plates are made. You can make one yourself with the gasket (New one should be used) as a template for a 1/4 steel plate. Thicker the better for this plate since it see extreme exhaust heat.
The Cheapest way is to remove the hose and plug the carb port or hose. LEave the EGR valve alone. A uncaped EGR valve is not a big deal at all.