Ultra-Small UHF RFID Tag Rain - 10 Pack - KIT-16464 - SparkFun Electronics

These tags operate in the UHF (865MHz to 928MHz) band and contains a 96-bit EPC field that is programmable by the user.

SparkFun Ultra-Small UHF RFID Tag Rain (10pk) - RobotShop

RAIN RFID Reader Modules: Impinj-Enabled, Partner-Built

SparkFun SEN-09569 HIH-4030 Humidity Sensor Breakout - Proto-PIC

Ultra-Small UHF RFID Tag Rain - 10 Pack - Unmanned Tech UK FPV Shop

UHF RFID Ring Antenna - SPX-15113 - SparkFun Electronics

Retired - SparkFun Electronics

Ultra-Small UHF RFID Tag Rain - 10 Pack from MindKits New Zealand

RFID UHF Modules - iDTRONIC Professional RFID

Ultra-Small UHF RFID Tag Rain - 10 Pack - Proto-PIC