Advertised, UN-advertised "specials"
Advertise to the local populace and all customers, via radio, TV, or mailer... that you will be running UN-advertised specials each week during during the "winter months, which around here is close to Dec 1 to Mar 31.
Kinda like a "blue light" deal at K mart.
The cutomsers KNOW that SOMETHING will go on sale , or be reduced for a whole week at a time
they need to come INTO the store to find out what it is,[this week] No sir, I cannot tell you over the phone!
But, by the same token, you could put up a list, INSIDE the store, telling what the "special" will befor maybe each of the next two weeks or so. AGAIN, folks would need to come in, to find out what it was that they could save money on.
If someone is considering a purchase on a "bigger ticket item" , it could be checked against the masterlist of upcoming specials, tell the customer and he/she would , likely be happy to know that waiting a week or two could save them some cash.
Happy buyers and more likely to return.