Low cost of german arty

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If I was being harassed by German SP-arty, I think I would purchase a mix of 82mm and 120mm mortars for counter battery.

The medium mortars will suppress effectively and will still have tons of ammo left long after the Hummels and Wespes are all out.

The heavy mortars also have more ammo than the SP-guns and have a decent chance of damaging or KO the German vehicles.

If the Germans are targeting your mortars, you could use a few armoured halftracks or Bren Gun Carriers to move some around and keep him guessing.
But if you site the mortars on rough ground or in shell holes they'll hold up quite well to the smaller caliber rounds.