Best Buy: 4L Analog Air Fryer only $29.99! Posted on March 26, 2019 by The Goddess Best Buy had the Emerald 4L Analog Air Fryer for only $29.99 as a Bonus Daily Deal – save $30! The twist-knob temperature controls and 30-minute timer let you precisely control the cooking process, and the slide-out food basket makes post-frying access convenient.