I totally agree about the horrors of puppy mills. But NOT buying a puppy from a pet store is sort of a catch 22, isn't it? Here's a person willing and able to bring this puppy into a loving home.....if she didn't, and took the "I'm not going to buy a puppy from a pet store route", what if everyone thought that---what would happen to the puppy then.
Like I said, I agree puppy mills are awful...but if the puppy is already there to be sold, I can't see how not buying those dogs would help.
OP---your new family member is precious!!!!! Best of luck, I love labs!! Mine has given us 12 years of complete love.
If you buy that puppy, it is immediately going to be replaced with another one, and another one and another one - fueling the demand for puppy mill puppies.
If you don't buy that puppy, it starts getting bigger and bigger. The pet shop / backyard breeder is spending more and more money feeding the puppy, its profit margin shrinking by the day.
Finally the puppy gets so large, the pet shop sells it at a loss to free up cage space or has rescue come in and get it. There is one particular rescue out there that specializes in store puppies that have not sold. The puppy will still find a home, but in the meantime, it has caused the pet shop / backyard breeder to lose money on it by 1) loss of moving inventory by not freeing up the cage space for the next puppy 2) having to sell it at a loss 3) extended food costs cut into profit margin due to less than quick turnaround.
If the demand for petshop / backyard breeder puppies falls and they start losing money on them, then the amount produced will start dwindling. It is basic Supply and Demand Economics.
But it is going to take education of the masses on how poorly bred and how much money after the initial purchase the unknowing buyer is going to have to shell out for genetic diseases, diseases like parvo, bad temperaments, etc to get people to resist that cute face in the window.
It is common to think "oh, he is there, I should rescue him." But that just creates an endless cycle and when the next Puppy Mill truck pulls up, the pet shop will pick through the still alive puppies (common for puppies to die in transit) and just replace him for the next naive buyer to take home.
OP, your puppy is adorable.
Hopefully you did go ahead and check to make sure the parents had all their health screenings before you purchased the puppy.
If not, my sincerest wishes (I mean this, not being sarcastic) that you are one of the lucky ones who will not be faced with huge vet bills in the near future to treat health issues or surgery to put those hips back together.
What a cutie! We have a black lab, and she is so much fun. Enjoy your new little one! Love the name too. 
