Do they make portable scanners?

[ho'ard]

Please read this question before you flame me (coughBGRcough).
I'm stuck paying half of one of my tenant's utility bills and I need a way to get a copy of the bills on-site.

Is there such a thing as a portable scanner that stores the info for later downloading to a computer?

I really don't want to drag my laptop around.

Can't tell from any of the portable scanners I find online whether they work this way.

Thanks!

-h'