Free 23andMe kits are back for people with four grandparents from the same sub-Saharan African Country (the site says "four (4) grandparents from the same sub-Saharan African country. Countries of interest include Angola, Benin, Cameroon, Côte d'Ivoire, Democratic Republic of the Congo , Ghana, Guinea, Guinea-Bissau, Niger, Nigeria, Senegal, and Sierra Leone.")
To see if you qualify click Here to read the official 23andpage. If you qualify, sign up and spread the word! If you don't qualify, please spread the word!
If you don't qualify, you might consider testing anyways....see the post: Why Take an Autosomal DNA .