I’d suggest 15mm.co.UK as first stop. After that the usual suspects. GZG, Rebel Minis, Khurasan, Armies Army. You should be able to find what you’re after from that lot. Thinking about it, GZG are probably the best bet for militia types. Check out their colonists.
I have (a few) GZG, (some to many) Rebel Minis, and (some to many) Khurasan – will keeping “mining” those sources. I will check out 15mm.co.uk and Amies Army giving preference (postage costs) to American sources. I have decided that to make room I need to unload about a dozen K. R. Multicases worth of 25 mm figures (keeping the cases) so it is a tit for tat operation right now.