Microtek Scanmaker 3840 can work perfectly with linux using at least sane 1.0.16.
2400x1200 dpi
48-bit color depth
8.5"x11.7" Scan area (letter/A4 size)
mine is a scanmaker 3830 which I think is same as 3840. When first set up I had to patch sane but I think newer sane versions include this model. It's good and it's cheap.
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