[Hampshire] Portable Printing

Hi,

Anybody have any recommendations for portable printers?

I'd like something that is as small as possible while still
capable of printing A4.

I'm not fussy about the print technology and I'm willing to sacrifice some
print quality to size, but it would be nice if it have a universal PSU
and/or could run on 110V, i.e. be usable in North America.

Any suggestions?

Andy