Just followed a link to J. B. Prince and saw that through 3/31, they have a special on Benriner mandolines (the little and the bigger plastic ones). Small are less than US$20 (!) -- the best price I've seen anywhere. And the bigger one is also a very good price.
I've tried both the large and smaller beniriner and found that the blades on the large one are less stable than those on the smaller version! So, unless you have a compelling reason to get the large beni, I'd stick to the small one -- and save some money too!