Shop-Accessories via Amazon offers Prime members the Snark Super Tight All-Instrument Tuner, model no. SN-8, for $10.49 with free shipping. (Non-members can spend $35 to bag free shipping; otherwise, it adds $5.07.) That's the lowest total price we could find by $2. It features a rotating display and metronome.
Amazon offers the Numark Mixtrack DJ Software Controller for $89 with free shipping. That's the lowest total price we could find by $50. It includes Virtual DJ LE software and connects to your PC or Mac via USB; it features two touch-sensitive turntables, a crossfader, line faders, deck EQs, and controls for looping and effects.
Amazon offers the Alesis Q25 25-Key USB MIDI Keyboard Controller for $64.95 with free shipping. That's the lowest total price we could find by $14. Features include 25 velocity-sensitive keys, pitch and modulation wheels, and octave up and down keys.