font purchase

Oriya MN for Windows

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I am looking for a font called Oriya MN. I can't find it available for purchase anywhere. It seems to be a OS X Mountain Lion system font

http://support.apple.com/kb/ht5379

If anybody could point me in the right direction, of how to legally obtain the font, that would quite awesome. Also, if instead one can name an alternative font, that may do the trick. I need the font to create artwork for a sign. My customer specified the font on their end.

What to do? Client wants me to use a font I don't have, but I can't bill for it and buying it negates the profit.

I picked up a client that uses Optima as their standard face. Despite it's ubiquity, I don't actually own Optima. It's a small email blast, so billing for the font would send the client elsewhere. Likewise, purchasing the Optima family would negate my profits.

Is there an ethical and legal solution here that still lets me make money on the project?

Can I obtain and use Optima for free (like a printer does) for use solely on this project because the client has already purchased it?

Any ideas out there?

Thanks,
Kenny