Amazon offers the XYZprinting da Vinci Jr. 1.0w WiFi 3D Printer bundled with a 300g PLA Filament and a $49 STEAM 3D Design Tutorial Gift Card for $299.99 with free shipping. Outside of the seller below, that's the lowest price we could find for the printer alone by $48. It features a maximum build volume of 5.9" x 5.9" x 5.9".

Don't care about the extras? B&H Photo Video charges the same for the printer alone.