Global

RS Components, Farnell/Newark, Mouser, Digikey, RadioShack

Europe

Austria: Physical Computing

Belgium: Tektonica, Antratek, iPrototype, Electroshop bvba, B-Electronix, MCHobby

Bulgaria: Robotev, Erelement

Czech Republic: HW Kitchen, PV Electronic, CzechDUINO.cz

Denmark: MemeMaker, Let Elektronik, ElectroZone.dk, Helmholt Elektronik A/S

Estonia: ITT Group

Finland: Robomaa.com, Paeae Technologies, Månsteri Store

France: AlyaSoft, Lextronic, Zartronic, Snootlab, Jlectronique, RobotShop, Semageek, Arobose, Mechs, Evola, GenerationRobots, Alpha-Crucis, MatLog, Go Tronic

Germany: Segor-electronics (search for "Arduino"), Watterott Electronic, Elektronikladen | ELMICRO, TinkerSoup, reprap source,Antrax, EBG Darmstadt (search for "Arduino"),Fritzing Shop, Komputer.de, German RepRap Foundation, MKelectronics

Greece: Knowledge Research, Citistore, Internet Now!

Hungary: Fablabbudapest

Italy: Online Smart Projects (smartprojects [at] tiscali [dot] it), Robot Italy, Eshopen, EtherMania, Regali e Desideri, Futura Elettronica, EmmeShop, Homotix, 7-three.com, RobotStore, ElettroShop, Robot Domestici, Lo spaccio di Nova

Retail LED Elettronica , Milano
Siro Elettronica Via Renier 67, Torino
Femet Corso Grosseto N° 247/H, Torino

Latvia: Argus

Lithuania: UAB "IDOIN", Modelis

Norway; ROBONOR, EHobby

The Netherlands: EZtronics, Turtle Creations, Machinecollective, Antratek, Doctor Bit, Freeduino.eu, FLORIS.CC, A-Blocks, Jee Labs, iPrototype, BRONTRONICS, Duinos, Extreme robots

Poland: KrisTech, Nettigo, Robo-Hobby, Smart Robots

Portugal: Gtronica.com, InMotion, LusoRobótica, PTRobotics, Sonigate Leiritrónica

Romania: electronista, RoboFun, Mecatronica.EU, Teguna, ROROID

Russia: Linux Center, Amperka, Pacpac, Domit

Serbia: Saperel d.o.o.

Slovakia: elektromodely, RLX COMPONENTS,

Slovenia: Tehnologija, Smak d.o.o.,

Spain: Libelium Cooking-Hacks, BricoGeek, e-lioness, TuxBrain, Cana Kit, Electan, Componentes Escobedos, OpenDomo, Voipminic, ardutienda, Microlog, Albacete Digital, Innova Didactic SL, Cetronic, ERA ROBÓTICA S.XXI S.L.U, Ro-botica Global, ELECTRONICA EMBAJADORES, S.L., Barcelona Cybernetics, Ingenieria de Microsistemas Programados

Sweden: Electrokit, Lawicel, Kjell&Company

Switzerland: Dshop, Boxtec, Alpha-Crucis, Play-Zone

Turkey: Robit Teknoloji, Robomore, Yazki Bilism Hizmetleri, RoboWeb

Ukraina: Digisoft, Parts, zubr.com.ua

United Kingdom: Cool Components, SK Pang electronics, oomlout, Robotiq, RobotBits, Proto-PIC, Earthshine Electronics, Hot Solder, Technobots, DTECH, Love Electronics, Domit, Active Robots Limited, Phenoptix, HobbyTronics

The Americas

Argentina: DitenTec, Intek electronica, OpenHacks

Brazil: Multilogica, Unite, RoboCore, BuildBot, Laboratorio de Garagem, Logic Parts

Canada: RobotShop , Lee's Electronic, SpikenzieLabs, Creatron Inc., Proto Advantage, Cana Kit, Solarbotics, eWerksonline, ABRA Electronics Inc.

Chile: Ingeniería MCI, Elektro Ingeniería Ltda.

Colombia: Dynamo Electronics, Tienda de Robótica, ELECTRONICA I+D

CostaRica: Crcibernetica

Ecuador: Digytronic, APM MICRO

Mexico: ElectroLabo, Pictronico, Cero-Uno, 5 Hz Electrónica, RoboDacta, Carrod Electrónica, ElectronicaEstudio, Sandorobotics, cosasdeingenieria, 330ohms

Panama: TecnoFutura

Uruguay: Bluetip

USA: SparkFun, Maker Store, Adafruit Industries, Little Bird Electronics, Modern Device, FunGizmos, NKC Electronics, Gravitech, RobotShop, Liquidware, Hacktronics, MakerBot Industries, Microcontroller Pros, Curious Inventor, AeroQuad, CuteDigi, EIO, Teach me to make, UltiMachine, Electrojoystick.com, Electronics is Fun, AME - After Midnight Engineering, Trossen Robotics, Jameco, Zagros Robotics, Advanced Micro Circuits Corp, iHeartEngineering, 3D Robotics, Jaycon Systems, Elexp, Abra-electronics, Reuseum, Pololu, 411 Technology Systems, Handmadecircuits, Aztec MCU Prototyping

Middle East

Israel: Dash Electronics, 4Project

Jordan: eshtre.com

Saudi Arabia: eshtre.com

Asia and Pacific

element14

Australia: Little Bird Electronics, Toys Down Under, RobotGear, Australian Robotics, ProtoGEAR, Squarebit, Bilby CNC

Bangladesh: SUMEET eShop

China: Seeed Studio Depot, DFRobot

India: Simple Labs, rhydoLABZ, 9 Circuits, PearlLabs, Cat Systems,Tenet Technetronics, Explore Labs, MGsuperLabs, SUMEET Instruments

Indonesia: Gerai Cerdas, Famosa Studio, Digi-Ware, Zaada Tec

Japan: MechaRoboShop, Switch Science, Strawberry Linux, Techand, MicroFan, Kyohritsu

Korea: Plug House, MakeZone, ArtRobot, Eleparts, JK Electronics

Malaysia: Homebrew & Technology, Rocket Scream, Masa Cipta, Cytron Technologies Sdn Bhd, E-Shore Technologies

New Zealand: Co-Lab, MindKits, nicegear, Robotronic

Singapore: sgBotic, Robot R Us

Thailand: Thaiduino, ThaiEasyElec

Taiwan: PlayRobot, ARoboto

Vietnam: Sotatec

Africa

Egypt: Future Electronics Egypt, Egyrobots, Ram Electronics

South Africa: Netram Technologies, Yebo Electronics, Micro Robotics

Tunisia: HMZ, Ast Group

Nigeria: Satajanus Bots