USA
UK
Digikey http://www.digikey.com/ Wide variety of passives and semiconductors. Overseas shipping is expensive! Mouser http://www.mouser.com/ Like Digikey but also tools etc Newark Element 14 http://www.newark.com/ - Allied Electronics http://www.alliedelec.com/ US affiliate of rs-components Jameco http://www.jameco.com/ Supercap2F: "Wide range of components; great catalogue and service" Radio Shack http://www.radioshack.com/ Limited component range; many stores Fry’s Electronics http://www.frys.com/ More products than components Electronics Goldmine http://www.goldmine-elec-products.com/ Supercap2F: "Neat stuff; hard-to-find components" MPJA http://www.mpja.com/ Supercap2F: "Lots of tools; great service" BG Micro http://www.bgmicro.com/ Supercap2F: "Oddball stuff; fast response" Futurlec http://futurlec.com/ Also has PCB manufacturing and other services All Electronics http://www.allelectronics.com California; they deal in surplus; recommended by DoubleDogDan MCM http://www.mcmelectronics.com/ More products than parts; maker stuff; security Full Compass http://www.fullcompass.com/ Pro audio/video; lighting; musical instruments Proto Advantage http://www.proto-advantage.com/ KJ6EAD: "Supplies an extensive line of SMT to DIP adapter boards." Sparkfun https://www.sparkfun.com/ KJ6EAD: "Arduino and other microcontrollers and their accessories primarily aimed at the hobbyist and student market. Also has Lilypad and other artistic electronic supplies." Adafruit http://www.adafruit.com/ KJ6EAD: "Arduino and other microcontrollers and accessories." Circuit Specialists http://www.circuitspecialists.com/ KJ6EAD: "Professional and hobby electronic supplies. Notable as a source of excellent Syntax prototyping PCBs." The Fiber Optic Store http://thefiberopticstore.com/ KJ6EAD: "Plastic optical fiber products for art." Madisound http://madisoundspeakerstore.com/ DoubleDogDan: "A very good speaker supply place." Parts Express http://www.parts-express.com/ DoubleDogDan: "General electronics, especially audio." Fair Radio Sales https://www.fairradio.com/ DoubleDogDan: "Funky "old school"/Ham radio/military electronics surplus."
Europe
Digikey UK http://www.digikey.co.uk/ - Mouser UK http://uk.mouser.com/ - Farnell / Element 14 http://www.farnell.co.uk/ Wide range of components CPC Farnell http://cpc.farnell.com/ Arouse1973: "Like a big Maplin; was bought by Farnell" RS Online http://uk.rs-online.com/ Wide range of components Anglia http://www.anglia.com/ - Arrow Europe http://www.arroweurope.com/ - Maplin http://www.maplin.co.uk/ Limited range of components; many stores Bitsbox http://bitsbox.co.uk/ shumifan50 says "good prices; delivery cheap and normally next day" Microchip Direct http://www.microchipdirect.com/ - Rapid Online http://rapidonline.com/ - Toby http://www.toby.co.uk/ - ESR https://www.esr.co.uk/ Gartmon: "ESR are worth a visit"
Australia
Ag Electronique www.agelectronique.fr/ - Arcade du composant www.arcadeducomposant.fr/ - allelectronique http://www.allelectronique.com/ - Conrad France http://conrad.fr/ OLIVE2222: "Domain available in many european countries (DE, BE...)" Electronique Diffusion http://www.electronique-diffusion.fr/ - Espace Composant Électronique https://web1.ibcfrance.fr - henri electronic www.henri.de/ OLIVE2222: "Reliable service" Lextronic www.lextronic.fr OLIVE2222: "Reliable service" Radiospares (RS) www.radiospares.fr/ - Reichelt Elektronik http://www.reichelt.com/ - RF Electronica http://www.rf-microwave.com/en/home.html - Selectronic www.selectronic.fr OLIVE2222: "Reliable service" Sim radio électronique www.sim-radio.com/ - SOS electronis www.soselectronic.com/ OLIVE2222: "Good prices on Simcom range" St Quentin Radio http://www.stquentin-radio.com/ - Tigal https://www.tigal.com/ OLIVE2222: "Reliable service" Wigi Diffusions www.wigi.fr/ -
Other
Element 14 http://au.element14.com Wide range RS Australia http://au.rs-online.com Wide range; free shipping within Australia Jaycar http://www.jaycar.com.au Better range of components than Dick Smith; local stores Dick Smith Electronics http://www.dse.com.au Limited range of components; local stores Altronics http://www.altronics.com.au - Rockby Electronic Components https://www.rockby.com.au - Oatley Electronics http://oatleyelectronics.com - Futurlec http://www.futurlec.com Also has PCB manufacturing and other services
If anyone has additions, or can provide comments (e.g. size and focus of products carried, chain of stores vs. e-order only) that would be useful to potential buyers, please comment via the Discussion tab, or PM KrisBlueNZ.[/td][/tr]
Solarbotics https://solarbotics.com Canada (ships to US); Supercap2F: "Lots of motors and sensors"

Component suppliers
Names and web addresses for companies that supply electronic components