I also use Igenity to do all of our DNA testing whether it's for homozygous black or genetic defects. Really like the folks there and the lab does a good job. One thing I really like is you can order the test online, pay with a credit card and send your sample with a copy of the order... It's easy and it's great!
I've also used GeneSeek in the past, and I believe Pfizer also has testing available. You might check the websites to see who's offering the best deal for what you want to have done.