Just a little update:
The inundation has continued. I now have three BIG cans of formula and 6 formula checks.
When I was telling my (childless, but bfed as an infant) brother about how disgusted I am about this, he said something similar to a pp on this thread, that is, "Why are you complaining that they sent you stuff when you signed up with them?"
This thread had me totally prepared with a response. I said, "What if you signed up, as your 24 year old self, with Phillip Morris to get free cigarette samples and coupons, and you got squat? Then, you signed up again, and this time said you were 15, and they sent you a carton of cigarettes? Wouldn't you think it was wrong that they were trying to target underage smokers, so they could hook the next generation and keep making money? They won't send
you coupons because they've already got their hooks in you."
And he totally got it!

We had a great conversation about it.