As well as Namerific.com and BrandBucket.com, I've just stumbled onto LogoTurn.com which appears to be a marketplace for designers to sell logos, but many are also including the domain as a package.

Embedded Link

Logoturn – Premium Stock Logo Design and Domain Names – Logos for sale
Great logos, for sale. Logoturn is a premium marketplace for logos and domains that you can buy today, and customize to your exact specifications. Happy browsing! Learn more.

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