Online resources
Websites
Zimmers
Comprehensive website - everything from schematics, manuals, ROMs etc.
The Pictorial C64 Fault Guide
The definitive pictorial diagnostic guide for Commodore 64 computers
Retroleum - The Retro Spares Shop
Sells various new, old stock and salvaged components for Commodore and Sinclair ZX Spectrum
Coolnovelties
Shop for videocables and spares
DataServe - Retro
Commodore 8-bit computer sales and the place to go for datasette belts
C64PSU
New reliable power supplies for Commodore computers
Retro Rewind Support Wiki
Various technical information to help you through your retro computer repairs.
Breadbox64
Nice repair guides for the Commodore 64 plus a lot more
Mouser Electronics (NO)
Online ordering of capacitors, chips, voltage regulators etc.
World of Jani
Comprehensive site for the repair and preservation of Commodore equipment (plus a lot more!)
DLH´s Commodore Archive
Comprehensive collection of Commodore books and articles
My old computer
Great site with all kinds of technical information for the Commodore machines (and others)
Retro Computer Verzamelaar
C64 common problems and how to fix it
Console5
Replacement for 1541 1551 Mitsumi/Newtronics/ALPS floppy drive spindle belt
AMIGAstore.eu
Spanish webshop (and also a physcial shop) offering spare parts and additions for Amiga- and Commodore systems.
Amiga Kit Store
Webshop offering spare parts and additions for Amiga systems.
Sordan
Retro Amiga webshop offering retro computing accessories.
Ray Carlsen Electronics
Ray Carlsen is THE number #1 person when coming to repairing 8-bit Commodore machines.
RETROCOMP.cz e-shop
My go-to e-shop for purchasing the best SID chip replacement - the ARMSID.
Social Media
Commodore/Amiga Norge (Norway)
Facebook site for Commodore enthusiasts in Norway. A good place to seek help and advice if you speak Norwegian.
Amiga Tech Tips and Repairs
Facebook site with the goal of to have a single place to share ideas on repairs, upgrades and modifications on all things Amiga.
Johans RetroData
Swedish Facebook site showing documented repairs on retro computers and accessories
Banner picture credits: pagetable.com