Best affordable Korean skincare for dry, mature skin?

Hi everyone, I'm looking for some Korean skincare recommendations for dry, mature skin. Many of the older people around me struggle with dryness, especially during colder weather. I'm looking for products that are effective but reasonably priced—not luxury brands, just good value for the money. I'm mainly interested in: - Moisturizers - Hydrating serums or ampoules - Toners or essences Budget is around $15–30 per product. What are your favorite products that actually work? Bonus points if it's something you've repurchased or recommended to your parents or grandparents. Thanks!