I would not spend any more than you might get a dog from a rescue for especially if it has no papers and is a mixbred.
www.petfinder.com might help you find one to rescue near you.
There are many pom rescues too - go to www.google.com and put in pomeranian rescue and your state to see if one is near you or check here
http://adopt-a-pomeranian.1-800-save-a-pet.com/
many rescues work nationwide and might have a pet needing a home near you. For that $350 you might get a dog with all the needed vet work done and a full personality profile so you know it will fit in your home!
Hope this helps you!
__________________
Please press Accept if you find my answer helpful. Want more info? Just reply on your question!
Bonuses for good work are always appreciated!
Thanks for the opportunity to help you!

