The Koerner Office - Business Ideas and Deep Dives with Chris Koerner He Turned $90 Into $50K by Mailing Ads⏐Ep. #291
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Apr 14, 2026 
Josh (Direct Mail Josh), an entrepreneur who builds shared-postcard ad businesses using USPS Every Door Direct Mail. He explains selling ad slots to local businesses, pricing and unit economics, filling routes and margins, using Facebook groups to find advertisers, and tracking response with dynamic QR codes. He also covers best-fit industries, campaign frequency, and how he scaled a side hustle into a profitable operation.
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Match Card Size To Business Type And Offer
- Smaller community cards (6x11 to 2,500 homes) suit brick-and-mortar businesses; 9x12 cards to 5–10k homes suit higher-ticket home services.
- Offers and repeat runs drive different purchasing behaviors (single vs. multi-month buys).
Include Dynamic QR Codes To Track Response
- Offer tracking: include a unique dynamic QR code on every ad and design unique offers to attribute responses.
- Josh designs ads free and supplies the QR tracking so advertisers can measure scans and test offers.
Free Cookie Offer Drove Immediate Walk-Ins
- A bakery offering a free cookie to 2,500 nearby homes got four immediate redemptions and 15–18 redemptions across a three-month run.
- The low-cost coupon produced walk-ins who purchased additional items and created local word-of-mouth.