It would be tough do develop a MANPADS that can reach the ~25,000 foot altitude of modern armed drones. But there are plenty of old vehicle-mounted Soviet systems that can. I think Armenia shot one down with an old SA-8 earlier this year.
Of course, I don’t know much about the going price of Soviet surplus SAMs these days, nor do I know much about how detectable these drones are on radar.
Not a manpad. An armored AAA system that operates in general support of tanks. But in any case, we won’t ever be operating tanks anywhere we do not have air supremacy. A drone chugging along at FL25 at 130kts will be/is helpless.
Radar aimed chain gun?
Haven't checked Cheaper Than Dirt lately, but probably get one for less than $500...🙄