Amazon.com: Raspberry Pi Zero to Pi 3B/3B+ Adapter, Connect Raspberry Pi Zero/W/Zero 2 W to Replace Raspberry Pi 3 Model B/3B+, Compatible with Pi 3B /3B+ Hats, Support 1-CH RJ45 Ethernet Port, 10/100
Amazon.com: Element14 Raspberry Pi 3 B+ Motherboard : Electronics
Buy a Raspberry Pi 3 Model B+ – Raspberry Pi
Raspberry Pi 3 Model B+ - Micro Center
Raspberry Pi Heatsink Pack for Raspberry Pi 3B+ - DFRobot
Adafruit Pi Protector for Raspberry Pi Model B+ / Pi 2 / Pi 3 B+ : ID 2292 : $7.50 : Adafruit Industries, Unique & fun DIY electronics and kits
Raspberry Pi 3 Model B+ (Plus) with 1.4GHz CPU 1GB LPDDR2 SDRAM USB 2.0 Bluetooth 4.2 and Dual-band 802.11ac wireless LAN