- Digikey - Mouser - SparkFun - Adafruit - Antique Electronic Supply - Sphere Research Corporation -Ebay, occasionally, if the seller is trusted and known

- Digikey - Mouser - SparkFun - Adafruit - Antique Electronic Supply - Sphere Research Corporation -Ebay, occasionally, if the seller is trusted and known by your corner of the electronics community. There are several mailing lists where you can get equipment and parts as well over on groups.io. - test-equipment-buy-sell-exchange - tekscopes - hp-agilent-keysight-equipment and other sources that I'm not remembering off the top of my head. Check out the EEVBlog forums, they probably have a list somewhere, or can tell you where they shop. Same with the various mailing lists. If they don't have it, they might be able to point you towards who does.