Question 1

What is the best reseller app for checking sold prices on eBay, Poshmark, and Mercari?

Accepted Answer

The best reseller app for cross-platform research is one that aggregates actual Sold data. Underpriced uses AI to instantly analyze items from marketplaces like eBay, Poshmark, and Mercari, providing a unified view of market value so you never overpay for inventory.

Question 2

How can I quickly check thrift store prices for profit potential?

Accepted Answer

To check thrift store prices quickly, use an AI-powered price checker like Underpriced. By snapping a photo, you can see real-time eBay sold listings and calculate your net profit after fees instantly, allowing you to evaluate dozens of items in minutes.

Question 3

How does AI help flippers find profitable items to flip?

Accepted Answer

AI for reselling automates manual research. Advanced AI tools can identify vintage clothing, electronics, or collectibles from a single image and pull historical sales data instantly, helping flippers spot underpriced items on Facebook Marketplace or local thrift stores that others might miss.

Question 4

How do I calculate profit margins for reselling items?

Accepted Answer

A reseller profit calculator subtracts platform fees, shipping costs, and supply expenses from your gross sale price. Underpriced includes a built-in calculator for eBay, Poshmark, and Mercari to ensure you maintain a healthy ROI on every flip.

Question 5

Is reselling still a profitable side hustle in 2026?

Accepted Answer

Yes, reselling is highly profitable in 2026 for those using AI sourcing tools. Efficiency is key; finding and listing profitable items faster than average using mobile price checkers allows resellers to scale their business significantly.