Which of these scanners, or like quality scanners, if any, would be worth purchasing without anything but the machine itself. I often find these machines for next to nothing, but I also know that it can cost a lot (not only money, but time) to find the necessary peripherals, software, etc., to make them run.

So my question is, which of these type of scanners may be worth my time, again, if any? Which of this class of scanner has enough users, third-party support, etc., to make it possibly worth a small initial investment of a $100 to $200 (it would probably cost me that much just to get one shipped to me, so even if free, it wouldn't be free for me.)?

I suspect the consensus may be just to forget it and wait for a complete system to pop up, which is the way I'm definitely leaning.