Xray XB8 question

Hi all,

I've got a buddy who has an XB8 he's wanting to sell to me. The nitro motor is shot in it, so it's been sitting on his workbench for a while. From what I've read, this seems like a good candidate for an electric conversion. So now, I'm trying to come up with a fair price to offer him for it. Other than the motor (which I don't care about anyways), it seems to be in good shape, although a tear down and cleaning are in order along with new wheels/tires. I've looked around but there doesn't seem to be a lot of sales pricing on these. So, my two questions:

1. What would be a fair price range for me to offer him?
2. Assuming this buggy is no longer manufactured, how easy are replacement parts to come by?

Thanks in advance!