Thanks for the help guys. I'm going with my gut on the Groth, the one I've held off buying for a couple of years, and will continue looking for it.
I actually bought the Groth a couple of weeks ago, but the vendor said he couldn't find it so he refunded my money. It's been about three weeks and I haven't seen him try to sell it at a higher price so I guess he was telling the truth.
“Aslan didn't tell Pole what would happen. He only told her what to do. That fellow will be the death of us once he's up, I shouldn't wonder. But that doesn't let us off following the signs.” - Puddleglum in The Silver Chair by C. S. Lewis