I would call and ask your local store directly. Different places have different schedules especially since planting times vary from state to state.

For example, Georgia stores probably won't discount until later in the year because you can continue to plant in Georgia right through November. A store in Ohio would probably discount earlier in the season.

sometimes they will haggle when they are down to that last little pile of trees and shrubs in the corner.

When the Christmas trees arrive and they need the space.