Allied Electronics
Black Box {LAN-WAN-Interface/Network Gear}
CDW {PC/MAC Computers-Networking-Supplies Cable/UPS/Software}
Dalco {Computers-Networking-Supplies Cable/UPS/Software-Motherboards-Hard
Drives...}
Digi-Key {Electronic Components}
Electronix Express {Electronic Components-Supplies-Test Equipment}
Global Computer
Supplies {Computers-Office Supplies-Software}
Grainger {Mechanical Hardware}
HMC Electronics {precision hand tools, soldering and desoldering supplies, static control products, test equipment, measurement and inspection instruments, chemicals and adhesives, work stations and PC board handling}
Jameco Electronics {Electronic Components-Computer Products}
MECI {Electronic Components}
Micro Electronics, Inc. {Notebook Computers, PC Gear, SOftware}
MilesTek Inc. {MIL-1553 Components}
Mouser Electronics {Electronic Components}
Newark {Electronic Components}
Omega {Temperature-Data
Acquisition-Pressure-Flow/Level-pH/Conductivity-Heaters}
PC Connection {Computers-Hardware-Software-Accessories}
RadioShack {Electronic Components}
Thomas Betts Corps
Total Tool {Tools}
VSS Inc. {Video Security}
Zack Electronics {Field Service Products-Test/Measurement Equipment-Broadcast
Products}
The listing for catalog sites are vendors that offered their products by way of a printed catalog, the kind found sitting around a lab.
Of course any company would also list the available products on the internet. However unlike component distributors, these sites also normally provide product descriptions and not just a part number.