Why the same item has different prices everywhere

Same item, different prices

You'll see the same iPhone selling for $150 on eBay, $120 on Facebook Marketplace, and $180 on Amazon. This isn't random. There are patterns, and understanding them helps whether you're buying or selling.

Fees change what sellers charge

Sellers price to end up with similar net amounts across platforms. This means:

eBay (13.25% fee) If a seller wants to net $100, they list at ~$115.

Facebook Marketplace (0% for local) Same seller lists at $100.

Amazon (15% fee) Same seller lists at ~$118.

For buyers: Local marketplaces have lower prices because there are no fees. For sellers: Calculate your actual profit after fees, not the sale price.

Different buyers, different prices

eBay buyers are comfortable with used stuff, deal-focused, often collectors or resellers, willing to wait for auctions, expect to pay for shipping.

Amazon buyers expect near-new condition, want Prime speed, less price-sensitive, have high return expectations.

Local marketplace buyers want to see items first, pay cash, negotiate hard, want deals, need it now.

If you're selling something with minor wear, eBay and local marketplace buyers understand. Amazon buyers might complain.

Where specific things sell best

Vintage fashion → eBay, Depop (collectors pay more) Electronics → Swappa, eBay (tech-savvy buyers) Designer items → The RealReal, Vestiaire Collective (premium prices) Furniture → Local only (shipping costs are prohibitive)

Auctions can go either way

Auctions drive prices up when:

• Multiple people want the item
• It's rare or desirable
• Auction ends at a good time (Sunday evening)
• Good photos and description

Auctions drive prices down when:

• Limited interest
• Market is saturated
• Bad listing quality
• Poor timing

Fixed price advantages: Predictable income, no waiting, "Buy It Now" buyers often pay a premium for immediacy.

Timing matters

Electronics:

• Lowest: January-February (post-holiday)
• Highest: November-December (gift buying)

Outdoor gear:

• Lowest: Fall/Winter
• Highest: Spring/Summer

Fitness equipment:

• Highest: January (resolutions)
• Lowest: March onward

Back-to-school items:

• Highest: August
• Lowest: October-November

Holiday events: Black Friday/Cyber Monday crashes used prices when new stuff goes on sale. Post-Christmas brings floods of returned and unwanted items. Tax refund season (February-March) can lift prices.

Location changes prices

High-cost areas (NYC, SF, LA): Higher prices overall, more buyers with money, better for premium items.

Lower-cost areas: Lower prices, more price-sensitive buyers, better for finding deals.

Shipping economics: Heavy items have lower prices locally because shipping is prohibitive. Light items have more uniform prices nationally.

How to get better deals (buying)

Check multiple platforms. Before buying, compare eBay (check sold listings, not asking prices), Facebook Marketplace, Amazon new and used, specialty platforms for your category.

Time it. Post-holiday for electronics. End of season for outdoor gear. Sunday evenings for eBay auction deals. Month-end for motivated sellers.

Negotiate locally. Always make an offer on FB Marketplace. Cash talks. Bundle for discounts. Be ready to walk away.

Total cost matters. Item price + shipping + tax = real price. Local might be cheaper even at a higher asking price. Factor in your time for pickup vs delivery.

How to get more money (selling)

Pick the right platform for the item:

Item	Best platform	Why
Rare/collectible	eBay auction	Collectors compete
Electronics	eBay/Swappa	Trusted, tech buyers
Furniture	Local	Can't ship
Designer fashion	Specialty sites	Premium buyers
Common items	FB Marketplace	No fees, quick

Price based on sold data. Research what actually sold, not what people are asking. Account for platform fees. Leave negotiation room for local sales.

Time your listings. Electronics before holidays. Outdoor gear in spring. Sunday listings for auction visibility. Avoid major holiday weekends.

Cross-list when it makes sense. Different platforms reach different buyers. Just remove from all when it sells.

How CostBuddy helps

CostBuddy pulls eBay sold data to show what things actually sell for - not what people are wishfully listing at. This helps buyers know if they're getting ripped off and sellers know what's realistic.

The short version

Price differences follow patterns: fees, audience, timing, location. Knowing these patterns helps you find better deals when buying and get better prices when selling.

Check multiple platforms. Don't trust asking prices. Look at what actually sold.