Jaycar sells 18 AWG silicone insulated wire. It’s much thicker and less flexible than the stuff I got from Lexel (and promptly lost), but I have managed to do spring bypasses and emitter leads with it.
Cutter Electronics sells 24 AWG Teflon and 18 AWG silicone insulated wire. I haven’t tried either yet but I’ve ordered some.
I’ve been meaning to start a thread about Australian component suppliers - those two are the only two I’ve found that sell in small quantities.