Our white girl, Ruga, most likely came from a BYB. We got (bought) her from someone who didn't want her after they found out she was deaf, and most likely they found her at a BYB.
Dasiy Mae is from a reputable breeder. With all health tests (thanks to this site I knew what to ask!). This was the breeder's first litter, but they worked with a seasoned breeder who they bought Daisy Mae's mother from. The breeder definately was not in it for the money. There were only five pups in the litter, one was given to Daisy Mae's mother's breeder(who helped with this littered), another was sold to a family that knew Daisy's father's breeder, and the remaining three (Daisy, her sister & brother) were kept a show prospects. Daisy's sister and brother had more flash and were considered, by the breeder, as better show prospects.
Meanwhile, I was being educated by this site and doing my homework elsewhere. I was becoming a pest to as many reputable breeders in Northern CA emailing & calling them until I got a response to find out if: 1) They had any puppies, or were planning a litter, 2) Knew anyone who had any puppies or was planning a litter, 3) Would give me any sort of other lead to find a reputable breeder. I went to a dog show and met about half the breeders I contacted. Then I started to work my way South. I finally came in contact with the woman who bred and sold Daisy's mother to Daisy's breeder. I would have never found them if I hadn't have been so persistant. They weren't actively trying to find Daisy a home, but had mentioned to the lady I contacted, that they didn't plan on showing Daisy and probably would want to find a pet home for her, eventually.
Finally, the reason why I know they weren't in it for the money was because they showed me all the bills for Dasiy (vaccines, parents health tests, etc.), added a couple hundred for Daisy's other expenses and care for 14 weeks and that is the amount I paid plus $200 that would be refunded once we have her spayed, (scheduled for the a day before Thanksgiving, so we can be home with her). We paid way below the $1000-$1500 mentioned in early posts. The only catch was I had to drive 12 hours (round trip) to get Daisy.
I'm not writing this to brag I got a good Boxer cheap (that's why I didn't disclose what I paid). I know I was blessed with this opportunity, or got lucky, however you look at it. I'm writing this to encourage others who are looking for a boxer to spend some time educating themselves, networking with breeders and handlers from their area at dog shows and other events, and be willing to drive (or fly) somewhere to get the companion you hope to have for the next 10-12 years.