The Noble Collection has some really lovely, though quite expensive, Harry Potter licensed collectibles.
One of them that caught my eye is this set of bookends. As you can see they depict the Hogwarts Express entering and exiting a tunnel:
They look really impressive. According to the official site they're hand painted and are each approx. 7.5 inches long and 5.5 inches high. I assume they're heavy enough to be useful (which is a key requirement of bookends!)
Pricing varies depending on where you see them - eBay, Amazon or the official site, but you'll probably end up paying €100 or more including shipping.