b-feller, Googled pot lid and found one for 24 bucks, yeah pricey.
Then I went to E-bay and searched 'universal pot lid' and came up with some a lot cheaper.
I know exactly what you want and to echo other posters a restaurant supply store should have it. But if there is none close to you may want to try E-bay.
Before criticizing a person, walk a mile in his shoes - then you are a mile away and you have his shoes!