I wonder how lopsided the drone / antidrone equation really is.
According to this article, Western military drones cost $200K apiece (ballpark — I'm sure, the price-range is wide). Russian ones are, probably, half that. Ukrainians are making their own at $60K.
Whatever it is, the cost of a single military drone is tens of thousands.
Now, a hand-held Stinger — capable of bringing down a real aircraft with a pilot fighting for his life — is quoted on Wikipedia costing $38K (though it is unclear, which year dollars those are). That's decidedly less than a drone already.
Considering that a) the anti-drone missiles don't need to be as powerful and strong as Stingers; b) things made in Ukraine (or Russia for that matter) tend to cost a lot less, a usable missile can, probably, be produced for "only" several thousand dollars apiece.
But even if the US made them — and gave to Ukraine — it would still be good bang for the buck, achieving a valuable military objective without giving Russia too much to protest about, because this new weapon would be "non-lethal".