blackwolfscd,
Actually, I just acquired the B-26 (Revell of Germany kit) last week. I think either Roll Models or Squadron had it in stock.
Roll Models, Internet Hobbies, and Squadron both have the A-26 Invader (Revell-Monogram) @ 1/48in stock. I think its new.
As for the A-20 Havoc, I think there are still some old AMT-ERTL kits out there. I got mine from Squadron last Spring, and I think they still have some left.
The A-28/29 Hudson and B24 Liberator are out there too.
Ahh yes the B10s and B18s. The B10s were the first bombers to see action (outside of Dolittle's B25s and a few B17s), and the B18s almost all got wiped out at Pearl... thus why no one knows much about them.
The heavies are the tough ones (i.e., B32 Dominator). I'm finding odd scales too for some of them, like 1/53 scale for the Lockheed Model 10-A Electra (a.k.a. C-35/ C-36/ C-37) made by Williams Bros. Oh well... maybe if I place it in the diorama at a distance (like in the back) no one will notice.
I've found a good number of them though. Lemme know if you're looking for a specific one. I might be able to find it.
Imagine the B36 Peacemaker, DC-5, Globemaster, Constellation, and Clipper all at 1/48!