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Best match for your query is the thumb-sized ESP32-C3 (RISC-V) Wi‑Fi + Bluetooth 5.0/BLE dev board: Seeed Studio XIAO ESP32C3 ($14.40).

Close alternatives (similar size/role)

• If you want another tiny ESP32-C3 board with an easy plug-and-play sensor ecosystem, consider Adafruit QT Py ESP32-C3 WiFi Dev Board with STEMMA QT ($20.00).

Same XIAO family (different chip)

• For a more powerful XIAO option (useful for higher-performance projects), look at Seeed Studio XIAO ESP32S3 Sense ($31.80).
• If you don’t need Wi‑Fi/BLE and want a different MCU platform, Seeed XIAO RP2040 - Supports Arduino, MicroPython and CircuitPython ($13.80) is a solid XIAO-form-factor alternative.

Kits

• To get started with multiple plug-in modules and an expansion board, the Grove Starter Kit for Seeed Studio XIAO ($120.15) is the most complete bundle in this catalog for the XIAO ecosystem.