Market range that I am personally aware of:
1. Resellers offer to buy for as low as 1.6 -- rarely 1.5 (Nea's, OLA 42, Twins & other locations. They spam local trade for hours)
2. Sellers ask as high as 2.5 (3-4 spot demand)
3. I have offered for sale (bulk lot of 500K+ bottles) for less than 2 without a sale, and have sold small spot demand as high as 4 (direct sale to crafter, spot market convenience) during the last 2 years.
4. Planet location impacts prices: Arkadia has a higher demand and lower production; thus higher prices currently.
5. I have not offered bulk lot sales below 2 since I started actively mining enmatters (I get enough FN to refine and sell ME) with effective value of 2 on sweat. Thus, no incentive to sell below 2.
Notes: As I have not yet converted all the sweat I have on hand, I don't buy sweat from others. FN that I use has generally been my own mining finds, but I will take opportunity to buy from auction if it's a really good deal; (auction price < my acquisition costs).