I know you're asking about what's a fair price but it's an area I by-pass since pricing varies so much for many reasons.
I just wanted to mention that you can upload the 325NG to 45 Super levels, if that's important to you. While it can't compete with the 44Mag it's a sizable boost in power when you want it.
The 325NG is pretty light (27oz.) even though it's got the steel cylinder so you still want some soft grips (Pac Diamond Pros work nicely) with the hot loads.
I removed the dead front night sight & added a red ramp (.225"H). Then removed the C&S fixed sight & slid in a factory S&W adjustable rear sight (.146" blade) so I can adjust for those lighter bullet's lower POI.
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325NG with 45 Super muzzle blast
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