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?
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.