5N-OSA,
Jeppessen approach plates cover most airports and approaches in Nigeria. The AIP Nigeria contains more airports and approaches. For example, for Benin DNBE Jeppesen gives you only VOR and Lctr plates while the AIP gives you ILS and GNSS plates. The AIP is issued in hard copy and in CD-rom format (approx USD 100).
The Nigerian AIP also has enroute charts but they only cover Nigeria. Jeppessen charts 5 & 6 cover Nigeria but they're missing a couple of waypoints here and there.
A few companies such as aero, overland and DANa have a few jungle jepp style approaches for airports such as Akure, Osubi, Bauchi and Bebi in their ops amnuals. I don't know how legal it will be for you to use them.