I have a set of adjustable rear camber arms for P1 cars
These are over $200 to buy new, I'm after $40 but the catch is that the bushes are worn.
However the car that I had them in handled fine and had no suspension noises so you could probably still use them if you wanted, or maybe replace the bushes.
Even on non-lowered cars these can be worthwhile to correct the camber.
Located in Canberra, or can post