First off let me say that I notice you put that in pounds and while I could convert it I think I'll let you do that.

I'm lazy (what did you expect I'm American)
Well in my experience most commissions (single character, pencils) will run you $20-$50 for an unpublished artists that has decent art. You're lookin at $50-$100 for published professional (non-super star level) than for your Jim Lee's and other crazy super stars $300-$600 for commissions. These of course change based on the size of the commission and what mediums (pencils, inks, markers)
You also have your original art sequentials from books that vary significantly from page to page and artist to artist. With that said for many artists of note expect to pay between $200-$600. This will change based on what characters are on the page or if its action or dialouge. A page with a crazy action shot with wolverine could go for upwards of $1000 based on the artist. Or if say it colossus and Kitty talking in the mansion kitchen it could go for $150 it all depends.
So for what you're willing to spend you could get a pretty stellar catch on one original art at a convention or a few good ones depending on how you swing it.
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