eQuilter always carries the Benartex foundations - although for a buck more than Brenda found them at the other site:
http://equilter.com/cgi-bin/webc.cgi...33111592947.3e
Here's the link to the Lone Star interfacing (along with a video of how it works):
http://www.quiltsmart.com/khxc/index...38inchlonestar