You can also sell most everything at the same temple. Anything the temple won't buy, I sell to the blacksmith or the guy in the lower left corner (first house you find when you enter Kuldahar for the first time) who buys keys and books.
Shop around. Different merchants might give you different prices. And like Fljotsdale said, try to sell in bulk -- you'll get better prices.
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Most Subtle Official Straightman of the Laughing Hyenas -- Grammarian Brigade.