The price of an infrared microbolometer is primarily driven by its Resolution (e.g., 384x288, 640x512, or 1280x1024) and Pixel Pitch (measured in microns, typically 12μm or 17μm). Smaller pixel pitches allow for more compact optics and higher sensitivity but often come at a premium. Additionally, you must evaluate the NETD (Noise Equivalent Temperature Difference); a lower NETD (e.g., <30mK to 50mK) indicates higher thermal sensitivity and justifies a higher price point for professional-grade thermography or surveillance.