Jean's advice is right on
There is so much research that needs to be done before getting a pup then just buying a puppy, you need to make sure that the activity level of the dog matches yours, whether or not you plan to have an inside or outside dog (even though studies are starting to show ALL dogs want to be with their pack) not all dogs can be outside 24/7 boxers being one of the breeds, do you have the time right now to put into training the dog? can you stay home with the dog for the 1st 2 weeks so it can be accustomed to its new life, whats your work schedule? do you have the time for the potty training?
everyone wants a puppy but have you considered a rescue? granted the average age is 1.5 years. but most of the time, their personality is developed, they are starting to grow out of the teenage stage, and they appreciate getting a better life.
Puppies are cute but eventually they grow up, they can not be soft and adorable all their life
If you have done all the researching and still want a puppy you will find that responsible breeders will not give puppies out till febish because so many people want a christmas puppy. these are the breeders you want, theses are the ones that care about their dogs.
Mandy gave you a link to the reputable breeders, good luck in your search and keep us posted.