Not very complicated. Manufacturers offer the best promotions now since they want dealer showrooms cleared to make room for the new 2019 models. Almost any reasonable offer would be considered on a 2018 model.
As spring approaches the left over 2018 models will actually increase in price or they will be sold out. So plan ahead and stop by to see what is available from Yamaha, Suzuki and Indian Motorcycle. Free winter storage is available and you might save big!