The only way you will be able to get any sales for the RA thread is is you have purchased a machine through Viking and/or Singer. When you register the machine, you get on their mailing list and email list. That's the way they send sale circulars or coupons. We recently got a paper shopping bag that was quite large with 15% off.
The Viking sales folks may extend some % off when they feel generous. Usually, it's limited to their own customers.