4.5" Hole Saw...Anyone got one or know where to get cheap?

[eblend]

Need to install a vent in the garage and need a 4.5" hole saw to cut a single hole through the the exterior wall made up of drywall, particle board, insulation and vynil siding. Anyone know where I can get such a hole saw for cheap, or rent it? I will most likely never use it again, hence why I need something cheap..

[sputnik]

Princess Auto usually has this kind of stuff pretty cheap.

[AndyL]

let me check when I get home, that's a relatively normal exhaust port size - so I probably have one...

[Jason Lange]

Home depot.

[dflamzer]

I think he said cheap. Even home depot I think the price tag is around $50 for the bigger hole saws. I do have a 4.5" I would just need to find the adapter for it.