When you say "88" do you mean the dual role anti-aircraft gun and anti-tank gun? Or do you mean a dedicated anti-tank gun?
Regardless, you have many very accurate options:
Flak:
AFV Club 8.8cm Flak 18
DML 8.8cm Flak 36, 8.8cm Flak 37, 8.8cm Flak 37 (late carriage)
Pak:
AFV Club 8.8cm Pak 43/41
In terms of not needing much, any of the above will get you a very accurate gun. With the addition of a Lionroar or Griffon PE set, you'll have a superb model.