Don't know if you already have the scanner or not.
The cheapest route might be to purchase a scanner on one of those
rebate deals where you buy a supposedly US$179 scanner for $29
(extreme range). Many of the scanners include TextBridge (by Xerox) that
will convert text in tables to an Excel sheet. The catch is that most
of the scanner boxes do not tell you what software is actually
included. I have two scanners and they both included TextBridge
and you can, of course, upgrade to a more complete version of TextBridge.
If you already have a scanner, then go over all of the software
included to see what was actually included.