Internet sales are governed by the contract created by the site and the consumer. Ticketmaster informs you that they are the agent of the venue and they are not the actual seller of the ticket and they indicate that the will apply the policy of their client to purchases. The B.R. Cohn Winery has a non-refundable ticket policy stated in their website.
I have done an extensive search of current federal law and checked Oregon law and could find nothing which guarantees you a refund. There is a three day "cooling of" period for purchases made from your home, however that does not apply here.
There are many articles from various legal organizations which discuss the law of clickthrough sales and how a vendor can ensure that the sales from his site are enforcible. They are all about disclosure of the terms and a consumer's opportunity to learn the terms of sale and agree. However, there is no provision for a seven day cooling off in connection with internet sales.
Having read the Ticketmaster site and its contracts, I believe that they may enforce the sale even though you tried to cancel immediately after. However, you never mentioned whether you got the tickets. If you did not get the tickets, or unconditional access to the tickets, then you CAN cancel the sale, based upon that fact alone.
Hope this answers your question.