Sorry to include the pricing.  That keyboard is £10 or $20 or with the mouse ball (which is crap btw) is £20 or $40 and shipping.  I see them at the computer shows and I know of a supplier if you are interested.  Black or Silver.  Maybe not the best for writing a book, but fine if you want it for windows.
I like the keyboards that edge posted, but at $100 you can do better.