I made my own contraption. If you have a DSLR cameras and a sharp lens you can get better than scanner results, and its easier to tweak the images in a program like Adobe Lightroom.
I screwed a monitor pole to a piece of plywood that was about 2x2 ft. Monitor pole being one of those thing where you can put a two monitors on top of each other. The pole came with a couple of arms that would attach to a monitor. Instead I bolted a camera mount to that, put the camera in the mount. Basically the camera was looking straight down at the board. I covered the board with black felt and put the pictures on the felt.
I used an 85mm lens because it was the sharpest thing i had. It wouldn't focus that close so I had to add extension tubes but that was no big deal. I also bought 4 cheap led lights desk lamps at wal fart and put those on both side shining light at as flat an angle as possible. This let me shoot at low iso's without super slow shutter speed. My camera had an hdmi out, so i ran that to a small tv that i could have on the same table. That let me manual focus and get it incredibly sharp, even with a thin depth of field.
Sometimes the picture would not lay flat. For those, I took a piece of glass out of a picture frame, cleaned the shit out of it, so no streaks, smears, etc and put that on top of the pictures to mash them flat.
Total cost, not counting camera, lens, and camera mount, that I already had, was under $100.
Oh I also C Clamped the board to the table just to try to take out any chance of vibration induced blur.