Receipt scanners, recommendations?

[jeffrey black]

I am using GnuCash (Windoze version) to track multiple sets of books.  
My personal, my farm, my wife's business, and for another family members 
personal and business.  Needless to say I am buried up to my ears in 
receipts and would like to go paperless by storing the images in 
GnuCash.  My flatbed scanner works but; is not a reasonable option.

Right now, my budget would have to be a maximum of about $400 USD.  I 
need to scan everything from 2 inch wide thermal receipts up to to full 
size 8 1/2 X 11  inch receipts.

As soon as I can replace several legacy apps I intend to ditch Windoze 
and move everything over to Unix (probably Ubuntu), so compatibility 
would be an issue.

I would like to hear your recommendations.

---JEffrey Black M.B.A.