Samsung Galaxy S8+ International Version - Dual-SIM - 64 GB - Co [SM-G955F] - $257.59 : Unlocked Cell Phones, GSM, CDMA and More | ElectronicsForce.com
Galaxy S8+ Dual-SIM Versions Are Now Available to Purchase in the U.S.
Amazon.com: Samsung Galaxy S8+ 64GB Unlocked Phone - 6.2" Screen - International Version (Midnight Black) : Everything Else
Amazon.com: LNONLS Dual SIM Card Tray Slot Holder Replacement for Samsung Galaxy S8 G950 / S8 Plus G955 Sim Card Tray with Open Eject Pin (All Carriers) (Midnight Black) : Cell Phones
Samsung Galaxy S8+ Plus G955FD Dual SIM 64GB 4G Unlocked Smartphone New Sealed | eBay
The Samsung Galaxy S8 will support dual SIM (but yours might not) - CNET
Amazon.com: MMOBIEL Replacement Dual SIM Card Tray Compatible with Samsung Galaxy S8 / S8 Plus 2017 - Incl. Rubber Seal and SIM Pin - SIM Card Holder - Blue : Cell Phones & Accessories