I doubt anyone would sharpen them for any price that would be reasonable vs $13 for new. The manufacturer was already set up to grind these in volume so it was probably economical for them. I suspect if you need to have them sharpened in quantity you'd have to set up something yourself. We live in a throwaway society today.
I'd give a call to Boggs Tool - they sharpen files using a steam/pressure abrasive process. They've done a great job on our tiny fine tooth jeweler files as well as all the larger sizes. Prices are really favorable!
Haven't asked about saw blades, but I wouldn't be a bit surprised if they handle them as well:
I have used these as cutoff saws for small stock. I think they usually come in from KEO. Because I lack the know-how and the tooling to sharpen them, I have never tried, and have just bought more, new.
$13 now & then isn't a budget buster.