First, thanks to those who answered. 

For the information of all, these are the results of the Locator Slide
search.

Gurley Precision Optics, http://www.gurley.com [$80][0.1mm squares]	
	Lovins Micro-Slide Field finder:
http://www.gpi-optics.com/Field_Finder.pdf

McCrone, http://www.mccrone.com/mac/home2.html [$150][1mm squares]*,**
	England Field Finder:
http://www.mccrone.com/cgi-bin/SoftCart.exe/mac/supplies/fieldfind.html?L+mc
crone+jven1292+1018639553

*McCrone promises that their finders are precisely interchangeable.
**McCrone also has Reflective Stage Micrometers

Regards to all,

Fred Monson

Frederick C. Monson, PhD   
Center for Advanced Scientific Imaging
Schmucker II Science Center
West Chester University
South Church Street 
West Chester, Pennsylvania, USA, 19383
Phone:  610-738-0437
FAX:  610-738-0437
fmonson@wcupa.edu
CASI URL:  http://darwin/wcupa.edu/casi/
WCUPA URL:  http://www.wcupa.edu/
Visitors URL:  http://www.wcupa.edu/_visitors/