• Advexure: A major North American distributor and integrator for commercial drones, offering solutions for various industries, suitable for wholesale inquiries.
• AeroExpo: A directory to find numerous manufacturers, filtering by 'professional,' 'surveillance,' 'inspection,' or 'heavy lift' (though 2kg is typically lighter).
• a2zRC: Offers specific surveillance quadcopters with relevant ranges (e.g., 2km), potentially good for wholesale buyers needing specialized units.
• DJI: The world's largest drone manufacturer, offering a wide range of professional and consumer drones that fit various weight classes, including those around 2kg.

1. Check Major Distributors: Contact companies like Advexure for bulk pricing and commercial packages.
2. Browse Manufacturer Directories: Use sites like AeroExpo to identify potential manufacturers and then contact them directly for wholesale terms.
3. Search for Specific Models: Look for models within the "very small" (250g-2kg) or "small" (2kg-25kg) categories on vendor sites like a2zRC and inquire about bulk orders.

• Payload Capacity: Ensure the drone can carry your specific sensors or packages (e.g., cameras, small delivery items).
• Applications: Drones in this class excel at surveillance, inspection (utilities, construction), mapping, and some light transport.
• Certification: For professional use, check for relevant certifications (like DGCA mentioned by a2zRC).