I asked this on Yahoo Answers, but I've come to realise it's not the best source of information for most things.
Anyway, I saw a book dealer use a device that scanned in a barcode and using mobile internet fetched the value of the product from Amazon and displayed it on a monochrome screen. He said he got it from a library.
Does anyone know what are these devices called and where could I buy one. Ebay is an obvious answer, but I don't know what to search for. Perhaps a well-known brand of these devices..?
I'd be glad of any information, as I really don't have any starting points for research. I see that with a certain app, an iPhone could do the job, but it's not an ideal solution.