Underpriced Blog

Tips, guides, and strategies for finding great deals and flipping for profit.

Feb 4, 2026 • 15 min

eBay Promoted Listings: Complete ROI Guide for Resellers 2026

Master eBay Promoted Listings with this comprehensive ROI guide. Learn how Standard vs Advanced works, optimal ad rates by category, when to use (and avoid) promotion, and calculate whether ads are profitable for your inventory.

Jan 30, 2026 • 10 min

Is Ray-Ban Worth Reselling? Complete Flipping Guide 2026

Discover if Ray-Ban sunglasses are profitable to resell. Learn to authenticate vintage Bausch & Lomb vs Luxottica models, identify valuable Wayfarers and Aviators, and maximize your profit margins.

Jan 30, 2026 • 11 min

Is Citizen Worth Reselling? Complete Flipping Guide 2026

Discover the profit potential of Citizen watches for resellers. From Eco-Drive technology to rare JDM exclusives, learn which models command premiums and how to maximize margins in the secondary market.

Jan 30, 2026 • 14 min

How to Write Listings That Sell: Complete Guide 2026

Master how to write eBay listings that convert browsers into buyers. Learn listing descriptions that sell with proven templates, title optimization, keyword research, and item specifics strategies.

Jan 30, 2026 • 14 min

Negotiation Tips for Resellers: How to Get Better Deals 2026

Master the art of negotiation as a reseller with proven scripts, haggling strategies, and tactics for thrift stores, estate sales, and online marketplaces. Learn how to negotiate buying and save thousands on inventory.

Jan 30, 2026 • 14 min

The Complete Reseller Tool Stack: Best Software and Apps 2026

Discover the best tools for resellers 2026. From price checking apps like Underpriced and WorthPoint to crosslisting software, inventory management, and shipping solutions—build your complete reselling software stack.

Jan 30, 2026 • 13 min

Your First $1,000 Reselling: A 30-Day Action Plan for 2026

Learn how to make money reselling with this proven 30-day action plan. From starting capital to your first $1,000, this step-by-step guide for reselling beginners covers everything you need to start flipping items for profit in 2026.

Jan 29, 2026 • 10 min

Is BAPE Worth Reselling? Complete Flipping Guide 2026

BAPE shark jackets and camo pieces flip for 150-500% profit. Authenticate WGM tags, distinguish Japan vs China production, identify rare colorways, and navigate streetwear resale platforms.

Jan 29, 2026 • 10 min

Is Levi's Worth Reselling? Complete Flipping Guide 2026

Vintage Levi's denim can flip for $30-200+ profit. Learn which styles are valuable (501s, 505s, Big E), how to date Levi's jeans by tags, authenticate vintage pieces, and source at thrift stores.

Jan 29, 2026 • 10 min

LEGO Flipping Guide: Make Money Reselling LEGO 2026

Retired LEGO sets appreciate 10-15% annually, flipping for $50-2,000+ profit. Learn which themes (Star Wars, Harry Potter, City) hold value, sealed vs built sets, and retail clearance strategies.

Jan 28, 2026 • 8 min

7 Signs You're About to Overpay on Facebook Marketplace in 2026

Learn the psychological tricks sellers use to get you to overpay on Facebook Marketplace. Spot retail anchoring, fake urgency, and 5 other red flags before you waste money. Includes 3-minute verification process and checklist.

Jan 24, 2026 • 17 min

Reseller Taxes 2026: The Complete 1099-K Guide

Everything resellers need to know about the 2026 1099-K threshold, taxable vs non-taxable income, 15+ deductions to claim, record-keeping systems, Schedule C filing, and quarterly tax payments.

Jan 24, 2026 • 15 min

The Complete Guide to eBay Fees in 2026

Everything resellers need to know about eBay fees: final value fees, payment processing, store subscriptions, promoted listings, and strategies to minimize what you pay.