The Gromit Unleashed Auction is streaming live right now (at the time of writing), the highest price one sold for so far is £44,000 for “Secret Garden”.
Check it out at http://new.livestream.com/gromitunleashed/theauction
Edit: “Watch Out, Gromit” just sold for £50,000 :D
Edit 2: “Newshound”, the only one to also feature Wallace, and created by Nick Park himself, sold for £50,000
Edit 3: “Gromit Lightyear” just went for £65,000….wow