Hello all. I am wanting to add some passenger cars to my layout. Here is the catch: I don't have a lot of funds laying around.  I have two OLD Life-Like passenger cars (60' scale length, train set quality) that I am working on fixing up to higher quality models. So far so good with the working on them.. But, I need to find more. 

Does anyone know where I can find some of these cars, cheaply? (like $5 or less?) They are certainly low quality, for sure, but it seemed easier to me to find some of those to rework rather than scratch-build entirely. (My layout is small: 40"x 60" so I prefer the "shorty" versions of the longer cars. On a small layout, it is not as noticeable the length difference since everything else is under 50' (scale).

I have been doing some searching, but not really sure where to find them..... Thanks in advance for any ideas!