Powerwerx.com
Anderson powerpoles and OEM power connectors for amateur radio and other DC Hobbies. Also, batteries, RF adapters, bulk wire, red/black zip cord.
http://www.powerwerx.com/

Jackson Harbor Press
Ham radio related kits and chips such as Morse code keyers.
http://jacksonharbor.home.att.net/ham.htm

NHRC Repeater Controllers
Repeater controllers and related accessories for amateur and land-mobile radios. Order by mail or phone.
http://www.nhrc.net/

EzATV
Amateur TV transmitters, receivers, and accessories for ham radio operators. List of dealers and distributors, online ordering.
http://www.4atv.com/

SHF Microwave Parts Company
Microwave and RF parts for datalinks, television, voice, and telemetry.
http://www.shfmicro.com/

Sphere Research Test Equipment
New and used electronic test equipment, tubes, semiconductors, RF and microwave products, and sliderules.
http://www.sphere.bc.ca/test/

Electronic Rainbow
Electronic kits for the hobbyist, education, industry, detective operations, and law enforcement. Includes CB sound, radio direction finder, and ham caller id kits.
http://www.rainbowkits.com/

Ramsey Electronics
Hobby kits, amateur radio gear, antennas, AM/FM broadcasters, security and monitoring cameras, test equipment, and tools. Downloadable catalog [PDF], FCC information, and forums.
http://www.ramseyelectronics.com/

Sherwood Engineering Inc.
Kits, components, and custom IF filter enhancements for most communications receivers.
http://www.sherweng.com/

North Country Radio
Kits, including transmitters and receivers. Technical articles and information on electronic subjects geared towards ham radio, shortwave and video projects.
http://www.northcountryradio.com/

Transel Corporation
Manufactures and sells communication equipment and spare parts. Includes online catalog, prices and shopping cart.
http://transeltech.com

Mini-Kits
Electronic kits and components. From Australia.
http://www.minikits.com.au/index.html

Ocean State Electronics
New and hard to find electronic components, kits, test equipment, and accessories..
http://www.oselectronics.com/

ESKA Crystals
Supplier of quartz crystals, oscillators and filters, both discrete and SMD versions.
http://www.eska.dk/

International Radio
Crystal IF radio filters and performance enhancements for ham and shortwave radio products, also publications.
http://www.qth.com/inrad/

BA1404 Chips for Sale
Sells hard-to-find BA1404 chip for low-power FM broadcast band radio transmitter projects. Includes links to low-power FM broadcasting resources.
http://www.radiochips.com/

ApogeeKits
Electronic kits, tools, instruments, and free tutorials.
http://www.apogeekits.com/

SS Tran
Sells the AMT3000 Broadcast Transmitter Kit, a Part 15 low-power AM radio broadcast transmitter. Includes details and background information, specifications, contact and purchasing information.
http://sstran.com/

Low Power Radio
Sells low power AM radio transmitters.
http://www.ontheair3.com

HamRadioFun
Radio kits, including a wide band active antenna, outdoor shortwave antennas, ham radio QRP transmitter, and an antenna tuner.
http://www.hamradiofun.com/

Barend Hendriksen HF Electronics
Radio and RF electronic components from stock, in The Netherlands.
http://www.xs4all.nl/~barendh/Indexeng.htm

Cinnabar Electronics
Offers a selection of transformers, chokes and parts.
http://www1.iwvisp.com/cinnabar/page4.html

Display Electronics
Supplier of electronic surplus parts from Thornton Heath, Surrey in England.
http://www.distel.co.uk/

Electrojunk
Buy, sell and swap vintage audio, radios, military, crystal sets, paper, parts, radio, scientific, tubes, from Alvin, TX
http://www.electrojunk.com/

Electronic Surplus
Sellers of VHF radios. Connectors, brand names, oscilloscopes, frequency counters, ECG parts and semiconductors, chips, and circuit boards. Buy online.
http://www.nmia.com/~elecsurp/

Fair Radio Sales Company Inc.
Sales of military and industrial surplus radio and electronics items, parts, and tubes. Lima, Ohio.
http://www.fairradio.com/

Harbach Electronics
Amplifier parts including heath wafer switches. Run by W8CQ in Melbourne, Florida.
http://www.harbachelectronics.com/

Jan Philipp Wüsten Elektronik
Vintage electronic parts supplier in Germany. On-line catalog.
http://www.die-wuestens.de/

Surplus Stuff
Surplus electronic parts, tubes, transformers, equipment, and technical manuals for sale.
http://www.surplustuff.com/

Lloyd's Dipsy Dumpster
Parts and pieces, advice, and vintage schematics. Extensive lists of old capacitors, and resistors.
http://www.lloydsdipsydumpster.com/

Max-Gain Systems
Air Variable Capacitors, RF Relays, capacitors, and fiberglass tubing.
http://www.mgs4u.com/RF-Microwave/air-variable-capacitor.htm

Mercury Magnetics
Featuring power and audio transformers.
http://mercurymagnetics.com/

Nationwide Radio & Eq. Sales LLC
Offers a variety of amateur radio parts and accessories.
http://www.marketworks.com/storefrontprofiles/default.aspx?sfid=86409

W7CKW: Gerald Cluff
High voltage capacitors, tubes, parts, and antennas for sale.
http://www.cluff.net/ham.htm

Computer Controlled Automation
Offers crystal radio supplies such as germanium diode variable capacitor.
http://home.earthlink.net/~computercontrolled/web1/

HobbyKits4U
Manufacturer and retailer of hobby and educational electronic kits.
http://www.hobbykits4u.net

Quality Kits
Components and kits for audio, RF, digital, and antenna projects.
http://store.qkits.com/

Crystal Radio Supply
Crystal radios kits, parts, and supplies.
http://www.crystalradiosupply.com