I'm no collector and all I know about graflexs is my research into budget entries into LF. The way I understand it the 3x4 models have the least value. Film isn't available so without a rollback only a collector would want one. OTOH the three lens can easilly be worth quite a bit. Depending on the lens any one of them could be worth more then you paid for the whole thing.

Is it the older version of this?

http://graflex.org/articles/series-d/

If so it's likely got a non-standard back in addition to the film issue.

I don't know what it's worth but I'm guessing it worth more then you paid for it.