TomTop offers the Nexbox 8GB WiFi Android TV Box for $29.99 plus $2.65 for shipping. (GearBest has it for cents less.) That's the lowest price we could find by $5. Features include an Amlogic S905X 2.0GHz quad-core processor, 1GB RAM, 8GB eMMC storage, 4K support, WiFi, Ethernet, and Android 6.0 (Marshmallow).
A close price: Topsuche via eBay has it for $33.99 with free shipping.