Just a heads up on some 1930s transports I've picked up recently and which might interest some people. All have yet to be repainted.
Delta Airlines 1934 Lockheed L-10 Electra by New Ray picked up from Toys R'Us for less than 10 euros. This is slightly underscale at 1/60 which is not too bad since you can have a transport plane on the tabletop without taking up too much space.

A P17 Citroën-Kégresse 1931 autochenille of
Croisière Jaune fame by Editions Atlas. Way overscale at 1/43, it doesn't look that bad with 28mm since most people are used to the oversize German half-tracks of WW2 (the steering wheel is a dead giveaway though).
This was released in France as part of a series of magazine-cum-model. Easily found on eBay (just search for "autochenille"), best prices on eBay France (original magazine price was 10.95 euros to give an idea). In the same series, there is also a 1922 B2 K1 Citroën-Kégresse used in the first crossing of the Sahara but this one will look more out of scale.

Some more pics here :
http://picasaweb.google.com/risaldar.singh/