WallScout is a product research tool built only for Walmart Marketplace sellers: retail arbitrage, online arbitrage and wholesale/WFS. Walmart publishes no Best Sellers Rank, so knowing whether a product actually sells is the hardest part of sourcing. WallScout estimates monthly units sold from tracked inventory data and shows it on the Walmart product page, next to up to 2 years of price and sales history, the live Buy Box price and seller count, and a profit calculator with real 2026 referral and WFS fees. Every estimate carries a data-reliability badge. When there isn't enough data to trust a number, WallScout hides it instead of guessing. Sellers use it through a Chrome extension or by searching a UPC or Walmart item ID, and can check whole supplier lists with bulk CSV uploads. Plans start at $13.99/month with a 7-day free trial.