Usually in December and July, Plant Therapy has their monthish of sales.
This is their Facebook group that has lots of good stuff on it.
I like
Real Aromatherapy Reviews & More and
Blue Tansy Analysis for finding out about different companies and oils.
FYI, Eden's Garden is on the 'not worth your time' list for mislabeled products, and poor customer service related to that type of issue.
I really want to try
Nature's Gift and
Stillpoint Aromatics. They have very good reputations and I believe Stillpoint you can get samplers.