I've been finding Aura Cacia brand EOs at a local discount store for an amazing price! They are usually rather pricey at the local hfs. The NOW brand is priced better if you cannot find a good deal.
I like Young Living EOs, also, although I have not purchased any in years. I have a bunch still from when I worked in a holistic health office and purchased them for the biz (deep discount) and was able to purchase a few personal ones each time I ordered for the same good discount. They are still doing well, but I consider them "fragrance" oils at this point because the therapeutic value is said to be gone after 2 years.
When I need new EOs, I plan to order from Mountain Rose Herbs (via link here on MDC). I've heard they offer good quality and I have seen the price is good.
I've ordered from Nature's Gift before and like their products.