I work at a marketing agency that does work for BFG, and we just finished designing a program for them that goes live at retail during the last week of June...
Buy four BF Goodrich H, Z, or V-rated tires and get a G-Tech unit free.
The program is good for purchases between 6/27 and 8/31 of 2001. The offer should be available wherever BFG is sold, but you probably won't see anything on it until late June.
Thought you might like to know... Too bad I bought my G-Force KDs before we thought this one up.