General Electronics
http://www.digikey.com/ – general purpose electronics mega warehouse, servos also , every component almost, fast delivery
http://www.jameco.com/ – general purpose electronics mega warehouse, servos also , every component almost, fast delivery
http://www.mouser.com – general purpose electronics mega warehouse, servos also , every component almost, fast delivery, a bit more pricy then digikey or jameco
http://crashspace.pbworks.com/w/page/9040487/Hacker%20Supplies
http://octopart.com/
http://shop.moderndevice.com/
http://www.newark.com/
http://www.mercotac.com/index.html – slip rings
https://www.arrow.com/ – general purpose electronics warehouse, student discounts available: https://www.arrow.com/en/campaigns/student-teacher-discount
Micro Electronics
http://mondomatrix.com/ Displayduino + ModoMatrix
Arduino Specialists
http://www.sparkfun.com/ – DIY shop, specializing in arduino kits, sensors, shields etc
http://www.adafruit.com/ – DIY shop, specializing in arduino kits, sensors, shields etc
http://www.arduino.cc/ – info on arduino, download arduino software here
Servos
http://www.robotshop.com/ – servos, servo hardware, servo gears sprockets, and pulleys
http://www.servocity.com/ – servos, servo hardware, servo gears sprockets, and pulleys
http://www.lynxmotion.com/ – servos, servo controllers, servo hardware
Prototyping
http://www.ponoko.com/
http://www.solidconcepts.com/
Robotics & Actuators
http://www.omega.com/ automation and sensors
http://www.wmberg.com/ mechanicals
http://www.pololu.com/ motors + gearboxes !
http://www.trossenrobotics.com fancy servos, controllers, and robotics kits
http://us.misumi-ec.com/vona2/mech/ mechanical components
Fabrics
Supplies for parachute rigging and general heavy-duty sewing projects
www.paragear.com
Good online fabric store for outdoor dear and heavy-duty sewing projects
www.seattlefabrics.com/
Ballistic fabrics
http://armorco.com/
One of the best findings shops in New York
www.steinlaufandstoller.com/
Good high-end fabric in LA and New York
www.moodfabrics.com/
Good high-end fabric in New York
http://bandjfabrics.com/
International Silks & Woolen
www.internationalsilks.com/
Plug and Wear – fabric circuits
http://www.plugandwear.com/
Leather
A great spot in New York
http://www.kaufmanshoe.com/
General leather crafts source… Like the Michaels of leather
https://tandyleather.com/
One of the best leather stores in New York
http://globalleathers.com/
Leather. From Texas. For boots, saddles and other cowboy stuff
http://www.panhandleleather.com/
Mechanical Parts
http://www.mcmaster.com the king
http://www.smallparts.com/
http://www.mscdirect.com
http://www.wmberg.com/ mechanical parts
http://www.sdp-si.com/ mechanical parts
http://rushgears.com gears
http://www.reidsupply.com
http://www.fastenal.com/ fasteners
http://www.martinsprocket.com/ power transmission
Metals
http://www.speedymetals.com/
http://www.onlinemetals.com/
https://www.metalsupermarkets.com/ (will cut to size)
Bobco Metal
http://www.bobcometal.com/
Tools
http://www.shars.com/
http://www.micromark.com/ (coupon code 212WC299 for 10% expires 2012-06-12)
http://www.carrlane.com workholding
As the name says: micro tools
http://www.micro-tools.com
Supplies, tools, etc (New York)
http://metalliferous.com/
http://sra-solder.com/ (solder)
http://www.clippard.com/ (pneumatics)
Luky’s Hardware Surplus
http://lukyshardware.com/
Materials
http://8020.net/ framing systems (compare to makerbeam)
http://sculpt.com/
http://www.smooth-on.com/
Shoes:
Everything you have always wanted to know about the best soles on the planet
https://us.vibram.com/
Weird, custom orthopedic stuff
http://www.soletech.com/
Birkenstock components from Germany
http://www.tobiasmayer.com/Birko-.htm-141.htm
Making jewelry:
Supplies, tools, etc (LA)
http://aajewelry.com/
Military Grade:
High-end military gear of all kinds:
This is the sh*t Navy SEALs get for free
http://lbtinc.com/
Breaching tools are only the start of the craziness here
http://www.adsinc.com/catalog/tools-instruments
This is the middle of the high-end market… Very “consumer” oriented…
http://www.blackhawk.com/
More
http://www.tacticaltailor.com/
And more
http://www.eagleindustries.com
I recently saw a SOCOM contract with a by name request for stuff from these guys
http://www.ottegear.com/
Also these guys
http://www.wildthingsgear.com/
These are some of the best backpacks you can buy
www.kifaru.net
Expensive helmets
http://www.ops-core.com/
Explosive Ordinance Disposal supplies and other gear
www.countycomm.com
Random
The best general online surplus/survivalist store
www.cheaperthandirt.com
Sailing and boating equipment, including a lot of interesting hardware
www.westmarine.com
Game manufacturer that has all kinds of goodies. Really cool arcade buttons in particular.
http://na.suzohapp.com
Remote Control Hobby Stores
http://www.robinshobby.com/