Shipping my PS3 to Nigeria... have some questions

So I posted my Ps3 on craigslist, got a hit almost immediately, but I have to ship it to Nigeria...

I'm in Texas, so how I would even begin to ship something across the Atlantic is the only problem. This guy is willing to pay the price I asked, and $120 to ship it. My only problem is that I don't know if that's what it's really going to cost, more or less.

Any advice?

p.s. Anyone want a PS3 and some games? :|