Massdrop offers the Juiced Systems USB-C 12" Macbook 5-in-1 Adapter in Gold, Silver, or Space Grey, model no. MBA-02, for $28.99 plus $2 for shipping. That's a buck under our January mention, the best now by $14, and the lowest total price we've seen. This unibody aluminum adapter converts the new USB-C connector into two USB 3.0 ports, an SDHC card slot, and microSDHC slot. Deal ends May 26.
Note: It's expected to ship June 10.
Update: Specs corrected.