I think the benefits of using olive oil are great--it absorbs quickly and helps cut down on those frizzy ends that I get alot of in the winter.  It also doesn't leave an oily look, but a nice shine.  The way I do it is, I oil the ends of my braid before pinning it up and going to bed, rubbing the excess oil on my hands along the length of the braid.

Plus, if you're like me and you use it for cooking anyway, you always have some on hand!

I have never seen jojoba oil so I don't know how it prices up against olive oil...you can get a bottle of the store-brand olive oil relatively cheap though.

Annelise

Olive oil doesn't work for me.  It is either too heavy and leaves my hair greasy or my ends get crunchy. 

Jojoba oil is more expensive, but worth it to me.