Wedding guest books

Does anyone know where I could get a wedding guest book? Think it is a nice idea. What is the average price of them and who does reasonably priced ones?

Have a look here: http://shop.ebay.ie/items/?_nkw=wedding ... &_osacat=0

marks and spencers have fab one its priced at 15 euro i think not much more my sister used it last year they have matching photo album as well

I got mine in Birthdays, think it was €13/€14