If I have an expired visa stamp, is going to a consulate outside the US the only option for an extension?

Yes. And even with renewal by mail, you must be in the country where you are renewing your visa.

Location: Bay Area/Columbus, OH

Remote: Yes

Willing to relocate: Yes (Columbus/Bay Area/Seattle)

Technologies: Javascript, Java, PHP, C#

Résumé/CV: http://www.batjaa.com | http://www.batjaa.com/Batjargal%20Batbold%20--%20Software%20...

Email: batjaa.batbold@gmail.com

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Location: Columbus, OH

Remote: Yes

Willing to relocate: Totally

Technologies: Java, Javascript+(common libraries & frameworks), C#, PHP, CSS, HTML5

Résumé/CV: http://www.batjaa.com

Email: batjaa.batbold@gmail.com