Art Controller Relay Board Kit : ID 1038 : $17.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Universal Replacement Relay for Minisplit's PCB – Everwell Parts Inc.
BHT Home Automation kit | ESP32 + 6 Channel relay from BHT Technologies on Tindie
SparkFun Qwiic Quad Solid State Relay Kit - Attach 4 Solid State relays to a Single PCB - Control Some serious Power All from The Easy-to-use Qwiic Connect System - configurable I2C:
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4Pin/5PIN Relay Socket For 40A JD Series Auto Relay - Lego Type Socket With Connectors Kit/ With 14+16 AWG Wires/ PCB - Buy 4Pin/5PIN Relay Socket For 40A JD Series Auto Relay -
Adjustable Alternating 2 Relays Kit, 18v (#5466) from NightFire Electronics LLC on Tindie
SparkFun Solid State Relay Kit - KIT-10684 - SparkFun Electronics
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SparkFun Beefcake Relay Control Kit - Melopero Electronics
GEN III Replacement Control Board (PCB) & Relay Kit for 36V DPI Relay Chargers | Diversified Power International, LLC