Looking for a scanner that will both sides of a page using a feeder

[PhoenixOfWater]

Hi,
I am looking for a scanner that will scan both sides of a page in one pass through a feeder. I have looked at high-end industrial scanners that do this, but I am looking for a scanner <$500 that will do the same thing. Any information would be great, links would be great too.

Thanks for any help