We have lost a lot of electronic parts dealers in the last few years. I thought Id post a few here that still carry parts we use.
Circuit Specialists have been around a long time. Still a good source for parts, also cheap enclosures. https://www.circuitspecialists.com/
Specializing in supplying parts to guitar distortion box builders is Tayda. I have ordered from them. . Cheap aluminum die cast boxes.
https://www.taydaelectronics.com/
Another one that has been around for a while. Still have tons of parts we need. Jameco.