what are the best sites to buy bulk herbs and oils and jars?

While there are a number of sites that do sell herbs of different types, I think there are two main sources.
First, the organic foods store will have a variety, but they may tend to be a bit pricey.

2nd, and my favorite would be to go to your neighborhood coop. I think co-ops re wonderful, and provide both organic and non-organic foods at relatively modest prices. and, (at least at ours) you can buy in bulk, any where from a 1/2 teaspoon of saffron to parsley by the pound.

If you bring your own containers, they will give another slight discount.

Another thing, in favor of co-ops is that if you buy a membership (at least in ours) they will give a substantial discount off your purchases.

And, last but not least, membership will allow you to work at the co-op, if you wish, and get another discount.

Great, plus you will have an opportunity to learn through the classes they present, usually for free.

Good luck