Got a Ghana Visa
I got a Ghana visa in Ouagadougou's Ghanaian Embassy on the 9th December.
I applied on a Tuesday and got it on the Friday, but applications from all through the week were all stacked up for dispersal on the Friday (mid-morning).
To be allowed to apply I had to explain why I didn't get my visa in my home country, and then with the application form I was given a blank A4 piece of paper and told to fill it with my explanation.
That I have been on the road longer than the three month validity was reason enough, and I showed absolutely no evidence to support my claim (had only been in Africa two months if they checked my Morocco stamp).
Reasonable price at 17,700 CFA, and I met a hot French student while waiting there and got taken for lunch.
A Dutch friend still on the road got his at the Bamako embassy, but said he paid "too much" - likely he will write his experiences here when given the time and good internet.
Hope this info is useful to someone.
Oh, also I am a U.K. citizen if that's a relevant factor too.