Please don't pay a puppy mill for a mutt. They are very poorly bred and you will have no guarantees about the dog. There are TONS of mutts on petfinder.com dying (literally) to have a loving home.
There are actually many of these designer mutts on there. Poor breeders and puppy brokers scammed uneducated buyers into buying a dog and promising all kinds of things about the puppy. Well, pup grows up some and the pup is NOT what the scam artist had promised. Pup is immediately turned over to a shelter or rescue. There are lots of expensive designer mutts being put to sleep in our shelters each day. If the pug-beagle mix look looks cute to you, check out petfinder.
For me, the pug and the beagle are two breeds that can have serious health and temperment issues if not bred well. I could never imagine breeding them together - that dog very likely could have ALL the bad traits and be one heck of a dog to train and maintain.
If you want a Pom, you can start researching quality breeders. There are lots of great lists out there to look for in a breeder. REmember that most good breeders will not sell a Xmas pet - so just be ready for that. XMas is the worst time to bring an animal into a home and good breeders don't want their animals to go through that so they will purposely not breed their dogs to have pups around that time. You could still "give" them a xmas present of a dog but instead go get the dog the next month when things calm down. That will also allow your entire family to meet the puppies and for the breeder to decide which is best for you.
Another option is to rescue a pom. I am currently contemplating a 3rd dog from this rescue:
http://www.hua.org/ Most of these dogs are puppy mill rescues, they are the momma and daddy dogs of the pets people buy from pet stores and internet ads. They live the worst life imaginable but are often saved through an auction when they are no longer useful to the kennel. I saw several poms on there.
Take this quiz to figure out what dog breed may be best for your family. Since it's a 10-15 year commitment, it's imperitive that it fit all your needs. I find this one the most accurate of all that I've taken:
http://aolsvc.decisionguides.aol.com/dogs/guide.jsp?page=1 Course this test will only cover true breeds in which temperment and qualities are consistent.
Good luck in your search!