Dell Home offers the Astro A40 TR Headset bundled with the Astro MixAmp Pro TR, and a $100 Dell Gift Card for $249.99 with free shipping. Assuming you use the credit, that's the best deal we could find by $99. The headset features a swappable precision microphone, 48-ohms impedance, and a frequency response of 20Hz to 24,000Hz. Deal ends April 30.