I just found my childhood big hauler and wanted to get it working for the kids.  It's probably from the late 80's and works with 6D batteries on plastic track.  I appear to be missing one piece of curved track and the remote control for this. 

Is there anywhere to get replacement parts?
Is it worth it, or are these a dime a dozen at toys r us?

Please excuse my ignorance, I don't know anything about these.

Tim