While prices vary widely, from buyer to buyer, sap is priced by the buyer most often. I am only familiar with my pricing. I only buy sap brought to the sugarhouse and I use the suggested pricing from the "Maple Journal". Each year, before the season they publish a recommended price chart, based on a 50/50 split. It varies by sap sugar %, the higher the sugar, the higher the price. A typical average is 2% but that varies widely dependant on the trees. A nicely thinned bush gives better % that one with crowded trees. Even after thinning, it takes time for the crowns to fill in. The better the crown the higher the sugar%. For sap, if using buckets a good average might be 15-20 gal sap/season, tubing on medium vacuum about the same and tubing on high vacuum might get 25-30 gal/season in an average season. Tubing on gravity gets considerably less. There is a new method on gravity that gets good results, if you have good elevation drops (slope) you can use 3/16" tubing and get good natural vacuum. For that read up on 3/16" tubing design methods.
In my case, the price only varies by the sugar %.
If you are looking at a large volume of sap, some larger producers might pick up, but the price will be considerably lower.
Last season, 2% sap was about $.36/gal. The sap must be clean, clear, fresh and must taste and smell good.
Dave Klish, I recently bought a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.