IMO that's a good price. Just added all those pieces up on a popular site I shop from and it added up to around $78. But that was without those black rear ground mounting plates which are almost impossible to get. In fact they only sell the right one (not the left) if you can find them at all. And they don't sell the rubber insert (which they use the same one in both the R and L).
I think you got a good deal.