Search for COUPON CODES by merchant/brand name. Do not use this tool unless the user is explicitly asking for deals, coupon codes, discounts, or other indicators that suggest the user wants to see deals on brands or product categories. EXTRACT merchant/brand names from user queries: - When user names a specific brand, just use that brand. - When user asks for a product/category without naming a brand, provide at least 20 well-known merchants/brands that sell those products. ONLY returns deals with coupon codes. Examples: - "Nike running shoes" → merchants=['Nike'] - "Nike or Adidas shoes" → merchants=['Nike', 'Adidas'] - "iHerb vitamins" → merchants=['iHerb'] - "gaming laptops" → merchants=['Best Buy', 'Newegg', 'Lenovo', 'Dell'] - "Best Buy" → merchants=['Best Buy'] - "makeup deals" → merchants=['Sephora', 'Ulta', 'MAC', 'NYX', 'Tarte']