What you need to do is continue to get the word out that you want sap. It's getting to late for someone to set-up a woods for the upcoming season. You also need to post what you would be willing to pay. If your add said something like ( looking to buy maple sap and willing to pay 65% ) a person at home could start doing the math and think about setting up their woods. A lot of people that might be interested in selling sap may think that 50% is all they would get. Most small operations or poorly set-up larger operations could only pay 50%. You mentioned you would pay more so that tells me your set-up is good. A person confronted Mike Farrell a few years ago saying that their was no way they could show profit buying sap at 60%. Mike asked them a series of questions about their set-up and came to the conclusion that if they bought sap at 60% they would profit $300.00 an hour. Mike then asked them if they made that at their real job. The person had nothing to say after that. People in your area might have a sizable sugar woods that they would consider setting up if the price was right. A potential sap seller needs to be assured that your in it for the long run. They don't want to set up a woods for a one or two year deal. So if you post the percentage you are willing to pay and then maybe and average per gallon amount that could help entice someone to bite. I wish you the best.

Spud