Help! Where can I get tint film paper for window tint

Hello everyone, I am wondering where I can get tint film sheet. I have tried going to home depot, office depot, staples, and kinkos - none of them carry it. I havent tried art stores yet.
Any suggestions? Any local stores are great too if you can refer me. I live in southern California, Orange county area and dont mind commuting to long beach, costa mesa or any area around there.
This is the only thing missing from my model, its almost done!!! so excited :)

Walmart carries window tint in the automotive dept

I thought this stuff was way easy to find...
most auto parts stores, if you want a lot. hardware stores, by the foot.
Auto window tint shops, ask for scrap.
Get the lightest shade you can, or you won't be able to see any interior detail.
Art/drafting supply stores sell a product called 'zip-a-tone', it comes in both opaque and transparent colors, a good choice if you want something other than a shade of grey, but it is expensive.
:p

Also any autozone or auto store should have it

oh duh... why didnt I think of autozone lol~
sorry, thanks for the replies though! I'll try it today if I can find one near by. :)

Stop by any place that does window tinting... they'll give you a small slice for free.