10-32 is correct the microdot size. Keep in mind that a special crimping tool is needed to install them onto the cable. That's one reason the option to buy a cable pre-terminated with female dots and cut it in half is attractive.
Alternate sources may be:
1) DPA extension cables (I think DPA now uses female microdot connectors on these. DPA used to use male microdots and female barrel connectors, which also works but is less ideal)
2) Test lab supply electronics companies (10-32 microdot is a not uncommon small coaxial connector for lab equipment test leads and interconnects)