Flat-coated Retriever Puppy Wanted

I'm 12 years old and I wont a puppy ythat will be vary protective of me because in my subdivion their is a person that I do not feel safe around and I wont a puppy that I can trin. The dog has to be good with small kids, good around other animals, house trained, low temper, and has to be under $100. I hope someone has a puppy they would like to give me. I also wont a girl because I had a boy dog befor and did not go so well with my female dog.