I have purchased my jojoba oil from Vitamin Shoppe online.  Here is a link to what they have to offer:
Vitamin Shoppe

Its most common use is for skin care.  If you have a health food or natural foods store or section in your grocery, you might look there for the oil.

I know there are other sources as well, I'm sure a few others will pop in here and give their sources.

Well, I got some jojoba oil at a small beauty store in the mall. They sold hair and kin care products and when I asked about it they showed me not only that but a few other oils they had in stock. I've only been in there a few times, so I can't remember the name, but it couldn't hurt to check any shops like that around you.

I found jojoba oil in both a local health food store and at a local Vitamin Shoppe (it cost the same at both places but the Vitamin Shoppe was 4 ounces vs the health food store 1 ounce). 
I like the Mason Pearson rake comb too.  I've also got wooden combs from Solano 2 and Sierra Legacy (my hubby is of the "if one is good, more are better" persuasion, lol).  I actually use all of them, depending on what I am doing with my hair, my mood, whether my hair is wet or dry.  One more decision to make in the morning when I'm running late for work ???....lol