When in doubt look it up on the department of state website
http://travel.state.govthere it says about a nigeria visa
QUOTE
ENTRY/EXIT REQUIREMENTS: A passport and visa are required. The visa must be obtained in advance. Visas cannot be obtained aboard planes or at the airport. Promises of entry into Nigeria without a visa are credible indicators of fraudulent commercial schemes in which the perpetrators seek to exploit the foreign traveler's illegal presence in Nigeria through threats of extortion or bodily harm. U.S. citizens cannot legally depart Nigeria unless they can prove, by presenting their entry visas, that they entered Nigeria legally. Entry information may be obtained at the Embassy of the Federal Republic of Nigeria, 3519 International Court, NW, Washington, D.C., 20008, telephone (202) 822-1500, or at the Nigerian Consulate General in New York, telephone (212) 808-0301. Overseas, inquiries may be made at the nearest Nigerian embassy or consulate.
Nigeria Info from Dept of State Websitealso go to the Nigerian Consulate's website in Washington at
http://www.nigeriaembassyusa.org/ and Nigeria's Immigration services at
http://www.immigration.gov.ng/index2.htmThis is on the application for a Nigerian Visa
QUOTE
VISA Fees are to be paid through the Nigeria immigration Website at WWW.immigration.gov.ng. Once paid,
print out the form and mail to the Embassy with a PROCESSING FEE of $20.00 in money order made out to the
Embassy of Nigeria. If expedited service is required, an additional fee of $65.00 in money order made out to the
Nigerian Embassy should be attached. Please attach original passport, colored passport photo showing full face on
white background, letter of invitation from Nigeria and return prepaid Fedex, DHL, UPS, or Express mail, if
applying by mail, DO NOT ATTACH ENVELOPE AND STAMP, your application will not be mailed back with
that.
Hope that helps!! Good Luck!!