I just bought a couple of Advantech AIMB-214E mini-ITX 1.86 GHz motherboards 
from a local surplus store for $25 ea (NIB).   They have 6 genuine RS-232 ports 
(two can be configured for RS-422/485).   Alas, the store don't do mail order 
and are currently out of stock (but the boards are around $50 on Ebay).  And 
suitable cases/power supples look like at least $50.  They can be run off of 
12V@2A from an on-board barrel connector.
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