Guild Wars 2

Are we able to sell dungeon runes and sigils? Does anyone know?

From the wiki:

‘It is possible to receive Dungeon-specific Runes from armor looted outside of their respective dungeons, as well as from the Mystic Forge. These Runes will still be Soulbound though.’

http://wiki.guildwars2.com/wiki/Rune

Sigils can be sold, runes cannot.

Edit: I believe sigils purchased from dungeon vendors are bound.