Sorry if this is late, but this forum seems a bit dead and I was checking to see if there were responses to a thread I posted.
We generally get our hinges from either home Depot, or Habitat Restore (used/ donated).
I can't tell you exactly what hinges we used for our shed, but I can tell you we definitely didn't spend 100 per. Probably more like $3 if we got them from habitat, or $10 new (just guessing based on other projects, it's been awhile.). I think we just used three heavy duty hinges (high,middle,low) and called it a day. Sorry I can't be more specific right now .. if you'd like I can take a picture later today?