The Mackie EM-USB offers a quality sound for just this purpose. It also delivers a reliable and rugged design at a reasonable price, making it both a suitable entry-level product, and a solid choice to augment a podcaster's existing collection.
With its cardioid polar pattern, the mic rejects sound coming from behind the capsule to tamp down on pesky room ambience; this is a plus for many people who podcast from their home. All the accoutrements you need to get started are included. Mount the mic on the supplied desktop stand, plug the included USB cable to your computer, and you're good to go. 
 
FEATURES
 
For Podcasting, Streaming & More
Works with Computers, iOS & Android
3.5mm Headphone Jack
Cardioid Polar Pattern Reduces Ambience
Gain, Headphone Volume & Mute Controls
Broadcast Quality 48 kHz/16-Bit Audio
Bus-Powered over USB-C Connection
Includes Desk Stand, Clip & USB Cable
 
SPECS
 
Microphone
Form Factor
Desktop / Stand/Boom Mount
Sound Field
Mono
Operating Principle
Pressure Gradient
Capsule
1 x Condenser
Diaphragm
0.55" / 14 mm
Polar Pattern
Cardioid
Orientation
Side Address
Circuitry
Solid-State
Pad
None
High-Pass Filter
None
Tone Adjustment
None
Gain Adjustment
Yes
Indicators
1 x Single LED (Status)
On-Board Controls
Gain, Headphone Volume, Mic Mute
Windscreen
None
Performance
Frequency Range
30 Hz to 18 kHz
Maximum SPL
130 dB SPL (1 kHz, 1% THD)
Sensitivity
-32 dBV/Pa at 1 kHz
Dynamic Range
89 dB
Signal-to-Noise Ratio
89 dB
Connectivity
Output Connectors (Digital)
1 x USB Type-C (on Mic)
Headphone Connector
1 x 1/8" / 3.5 mm
Digital Audio
A/D Conversion
16-Bit
Sample Rate
48 kHz
Operating System Support
Android, Windows, iOS, macOS/OS X
Available Port
USB 2.0, USB 3.0
Power
Bus Power
USB
Operating Voltage
Not Specified by Manufacturer
Physical
Color
Black
Mounting
Mic Clip, Tabletop (with Included Hardware)
Certifications
CE, as per Manufacturer
Dimensions
ø: 1.8 x L: 7.1" / ø: 4.57 x L: 18.03 cm
Weight
0.87 lb / 0.39 kg