Here is a list of participating products. Sounds like almost the whole store ;) I would not go out of your way to reach the $100 for this promotion...but if you happen to reach it in your heists...all the better!
I now have confirmation (from my own receipt) that the total is BEFORE coupons!! So you should be able to add up to the $100 pretty quickly without even trying! I did not even pay attention to the buy and save stickers, and I still contributed over $36 toward my $100! (And only spent $4 for the whole lot hehe)