Amazon offers Prime members the Holga Sunset Blvd Holgawood Collection 120N Medium Format Camera in Mustard for $19.99 with free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $5.40.) That's the lowest total price we could find by $3, although most stores charge over $30. This plastic lomography camera uses 120mm roll film and has a built-in 60mm lens.
Amazon offers the Nikon 105mm f/2.8G IF-ED AF-S VR Nikkor Lens, model no. 2160, for $734 with free shipping. That's the lowest total price we could find by $145. It features a silent wave motor and vibration reduction for close-up and macro photography.
Amazon offers the Samsung 30mm f/2.0 NX Pancake Lens in White, model no. EX-S30ANW/US, for $199 with free shipping. (Adorama charges the same; while B&H Photo-Video charges a buck more.) That's the lowest total price we could find in any color by $76. It's compatible with APS-C compact Samsung NX cameras.