You put yourself in a hard position here. I feel your pain.
I wanted to welcome you to YT and commend you on coming here to seek advice.
What happened to you is exactly why I will not go into stores that sell dogs. Back in the day, I didn't realize that they got their pups from puppymills. Now, I do.
So, now your heart has been stolen by this sweet puppy. And, we can make the argument that the puppy didn't do anything wrong and needs a home. But, bottom line is that this puppy's parents came from a puppy mill and they are suffering in terrible conditions. To buy this pup (and that is a crazy amount of money, by the way!), would be keeping this store in the business of torturing dogs to produce puppies that people think are "cute" and "in".
I would just have to say a prayer for that baby puppy and her parents and move forward to find a reputable breeder.
If you go for the puppy in the store OR the one that is for quick sale...you have no idea what you are getting. In the long run, you will have your heart broken more when a puppy store puppy ends up taking over your heart and then it comes down with dreadful illnesses..which is highly likely.
So, advice? Yes, run. And good for you for coming here to seek answers!