Generally, responses to a thread are answers, but I have a question. I know nothing about these scanners, but your question made me curious, so I did a little searching on eBay and Google, and found a multitude of scanners available for as little as $10 to more than I could ever spend.
I know that if it were a government or business with high security documents to protect, price would be no object, but for someone that simply wants the convenience of a scanner vs typing passwords, what is the least price required to purchase a good scanner? For me, it would seem to be reliability that would be most important, as that I doubt that I will ever have anybody trying to hack my computer anyway. Of course, it would be easier for them to cut a finger off the user than cracking a good password, but I really have no worries about that.