Can I Purchase (and manually install) Mac OS X 10.7?

When I search for software updates the system tells me I am up to date. I am running Mac OS X 10.6.8, so I know that there are further updates out there. Is my Mac out of date, or is there a way that I can purchase and manually install the update(s)?

(I am currently in need of at least Mac OS X 10.7 for an application I downloaded, but I know I'll need newer updates in the future.)

Thank you for any and all help! (:

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