I had that EXACT model until this past weekend when I sold it for $200. I had turned down two lower offers before selling it to a shooting range, who will use it as a rental gun. There's just not much demand for a long barrel on a gun marketed as a self-defense weapon. Also, the word 'Taurus' printed on the side doesn't add much value. For what it's worth, I ran ALOT of super hot loads through it, and was pleased with the price I was offered.
Hope that helps you determine your asking price,
P.S. - Since location ALWAYS matters, I must tell you that I live in central Texas. I hope markets are better in your neck of the woods!