Retailers often mark down pre-assembled or "stock" cabinets by up to 20% in late November and December.
If your goal is to save on the (cabinets + installation), mid-winter is the winner. What Is The Best Time Of Year To Buy Kitchen Cabinets? best month to buy kitchen cabinets
Look for sitewide discounts (often around 10%) on entire kitchen projects. Retailers often mark down pre-assembled or "stock" cabinets