Trinkets, DC connectors, that sort of thing

Wonder if there are stocks in HSBNE? Like DC connector OD 4mm & OD 2.5mm varients? I had the impression these things are really difficult to get in Aussie, but I am just a new immigrant and you know better. A buddy is coming from China so if it make sense I can ask him to bring bags of such odds and ends to share. It costs close to nothing there.

This sounds like a topic for @merseyless, the man for space electronics and stuff.