Rest Models has two new pre-WWII figher aircraft kits which are exclusively available at HobbyTerra.com. Both are 1/48 scale and pre-WWII era Soviet planes designed by Polikarpov. One, the I-15 also played a role in the Spanish Civil War.

Polikarpov I-15 'Chatos' fighter. Scale: 1/48
more info: http://www.hobbyterra.com/product.asp?idproduct=267

Polikarpov I-5 Soviet WW2 fighter. Scale: 1/48
more info: http://www.hobbyterra.com/product.asp?idproduct=266