Mercari: free 1 oz First-Class Envelope labels for trading cards through Jan 4, 2027
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From September 17, 2026 (12 a.m. PT) to January 4, 2027 (11:59 p.m. PT), Mercari's prepaid First-Class Envelope label costs $0 for trading cards and paper collectibles up to 1 oz, and 49¢ for 2-3 oz (the 49¢ rate has run since February 16, 2026). Mercari's regular envelope prices are $0.74, $1.03 and $1.32 for 1, 2 and 3 oz. The envelope must be 5 to 11 1/2 in. long, 3 1/2 to 6 1/8 in. wide and up to 1/4 in. thick. New listings could be opted in from September 17 on the latest app version, and Mercari said existing listings would be opted in starting September 30; its promo terms say an existing listing qualifies when you open it, select the promotional rate and save it, and changes made through Promote don't count.
Your net on a $10 / $25 / $50 sale: +$0.49 / +$0.49 / +$0.49
If you pay for a 1 oz Mercari First-Class Envelope label: $0 instead of the 49¢ promo price before Sept 17 (+$0.74 against the regular price). If the buyer pays shipping, Mercari's 10% fee on that shipping falls by about $0.05.
Source: Mercari help: Shipping change announcements (Sep 17, 2026) · Mercari help: Fees on Mercari (envelope rates) · Mercari: limited-time shipping deals (promo terms) · verified
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The Reseller Index change tracker, "Mercari: free 1 oz First-Class Envelope labels for trading cards through Jan 4, 2027," https://resellerindex.com/changes/mercari/2026-09-17-mercari-free-1oz-envelopes/, verified Oct 19, 2026. Free to reuse with a link (CC BY 4.0). First published on the tracker Oct 19, 2026.
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