There's alot really, most emblems were attainable when the game was release & it's public beta (which those emblem are no longer attainable)...Bungie offten do promote their own merchandise at their store which sometimes include a special *emblem* via email once an item has been bought...
...Srry to this but it's too late "if" you're trying collect them all.
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No, I have the emblem.. I just was wondering if it's rare because then I'd probably use it more.