Megan just emailed me to say she had gone to her CVS this morning to pick up milk since it was on sale for $1.99. She bought three gallons and when she checked out, she received $3 ECBs for buying the milk. There is an Oreos and milk ECB deal running this week so it looks like it might be possible that the ECBs were triggered because of this–only she didn't buy any Oreos!
If you need three gallons of milk and you have a CVS nearby, you might consider stopping in there to buy your milk to see if it generates $3 ECBs, too. I can't guarantee that it will, but it's worth a shot. Megan has more details posted here.
If you try it, let us know if it works for you, too.