Not too sure about G2 Grimlock as I've never really looked into it, but the S.T.A.R.S. base is pretty rare to find complete and not in a destroyed through play state. It also had multiple components so online sellers tend to separate them and they are all pretty expensive. I got super lucky obtaining mine a couple of years ago, but still paid in excess of $150 AUD for just the base and poster with a handful of bios.