From what I know about that name its linked to a breeder who breed not just boxers yet many different breeds. * No health testing and yeah you can get a dog that has the right paint job as a boxer for 400 buck, but no guarantee its going to be healthy, have a solid temperment, nor grow up to have the true characteristic that a boxer should have.
Check out the breeder section above. *There is some links that could be good starting points. *Also do not rule out rescue either. * Check www.infodog.com
for any upcoming shows as well as your local boxer club. *Take time, do research for your perfect puppy because IMO it soooo worth it