A pair of Church Audio CA14 omnis is probably a good choice, though note that his shipping times can be...erratic. They're great bang for the buck, though, and are fully capable of making great recordings. For recorders I know some Oade modded units show up in the Yard Sale from time to time but others know more about that. You'd want some sort of battery box or preamp to go with the mics. If you're not worried about going deep stealth mode, a Church Audio CA9200 is a good option. That can certainly be stealthed, but something like an Ugly Battery Box would be even better for going deep undercover.
The other mics that come to mind are Audio-Technica AT853 cardioids, which you should be able to get from Sound Professionals. You'll likely want to get the "4.7k" mod (I think they call it the low sensitivity mod).