It scans the retailer’s published prices daily and records changes, helping shoppers review detailed product price histories and identify when an item may be a good value. Users can set email alerts for products they follow and receive notifications when prices drop or favorites become available again. The site also gathers current Costco México coupon booklets and lists promotions across categories such as electronics, home, groceries, health and beauty, clothing, and sports. Its product examples include appliances, automotive supplies, furniture, wine, and electronics.

Shoppers can browse monitored products, compare current prices with past pricing, and use lifi’s shopping guide to learn how the service works. Creating an account is free and includes a 20-day trial with full access. After the trial, paid plans start at 19 MXN per month and include unlimited price alerts and ad-free browsing. lifi is designed to help Costco México customers make more informed purchasing decisions and avoid missing discounts.