[Groop] Aragones Original Artwork

[J Brooks]

I noticed on Ebay someone is selling a couple of original art pages from 
Groo #12.

I hope to one day make it to a convention where Sergio is, and buy some 
original art, be it commissioned drawing, original page from comic, or even 
original cover from comic.
Can anyone give me a rough idea of how much each of these things would cost?
And are these kinds of things available at each convention Sergio visits?

Thanks Groop,
J