I use Gibson Luthier's oil.

I probably pay too much for it, since it's from gibson and I'm from canada and the exchange rates just kills me!!!!!

No it's about 6$ CND so I would say 4$ US.

Does a really good job.

I used lemon oil once on the bridge of my accoustic/electric guitar and it went almost black, well very dark. Gives a real good look since my guitar is black but I'm not sure how it would have looked on a light toned guitar.