Kitty, I visited the From Nature With Love site and it makes sense that the 4 oz bottle should cost $84.79 as it does, because 1/4 oz costs $12.94 there. That is probably about what it would cost at your local health food store for ylang ylang essential oil, but I usually only see the 1/4 oz (or maybe 1/2 oz) at my local stores. The good news is, if you are only buying it for your own personal use and plan on using it as you would use other essential oils in a carrier oil base, you probably won't need 4 oz. The 1/4 oz size will probably last you a long time.
The other ladies in the thread who have purchased ylang ylang EO have not mentioned the size of the bottle, so I'm not sure if they got 4 oz for such low prices.
I visited Puritan.com and they have a product named "Ylang Ylang Aromatherapy" in a .34 oz size for a buy 1 get 2 free special at $12.95. However, their 'sneaky' wording, along with the wonderful price, makes me suspect that may not be a pure essential oil and may be a blend of other things with ylang ylang just used as small ingredient for scent. I'm not sure though.
SassyGirl, since you've ordered from there, if you don't mind, can you tell us if what they sell is a pure essential oil? I've never use ylang ylang EO before but would like to. They will definitely get my business if it is pure and of good quality!