There are new cheap ones like these:
http://www.ebay.com/bhp/binocular-microscopeBut first read this: Why you should not get the cheap ones but it's your choice.
http://www.themelis.com/Education-Optics.htmlAn electronic hobbyist bought an AO 569...
http://mightyohm.com/blog/2009/01/new-stereo-zoom-microscope/My analysis...what you need is a stereo microscope typically used by gemologists to see precious stones/jewelery. AO569 maximum magnification is 30X which is sufficient for smd work.It also zooms
but a more powerful one is AO570, it's 42X. American Optical no long makes microscopes and are relegated
to museum pieces though there are many still used today especially biomedical types with multiple turret objective lens which are not suitable for smd because their working distance is too close to the object.
If you can get AO569/570 complete with stand/base then by all means if you are a patriotic american.
If given a choice I would not use AO569/570 because technologically it uses mirrors in the optical system.
As you may know if you are photography enthusiast cheap digital SLR cameras use mirrors instead of real solid glass prism to bend the image 90 degrees similar to stereo microscopes/binoculars to the eyepiece
lens.This means that compared to a glass prism the mirors are less bright but you may argue that extra lighting attachement will be used ...fine.
So a better deal would be the more established brands western or japanese. My pick will be Olympus' older sz series like SMZ10 or any of the recent ones if you can get at a good price.
make sure they come complete with stand and or light attachments.Many on ebay are just the microscope or pods without stand/base.