If I remember correctly, on the newer model VE's they may not come out. The gun I just put the spring in is from 2007 and I had no issues. Email Jeff and ask him, I'm sure he would be able to tell you. Sorry I was no help.
I'm in MD and they always cost around 375.00 new. I never see any SD's used for some reason. After you factor in transfer fees and tax, like you said, 325.00 sounds about right to me.
Sorry, it would have been helpful to put that in the post. I ordered a sear spring for the trigger mechanism. I was wondering if anyone has put one in their Sigma.