in the sporting goods section...
then outdoor sports, then cycling.
"Swing Arm" usually works for me.
They're sporadic, but if you're systematic, you can get some good stuff. I've scored 3 carbon fiber K2 Proflex swing arms that way, form $15 to $50 USD.
You might e-mail Maria directly to see if she has any damaged returned frames that she'd consider selling you all or part of.
If your frame is typical, a V1 swing arm will probably line up the shock with your existing front shock mount better. The V2 uses a shorter vertical dimension on the swing arm that may cause you shock alignment problems.
Cheers,
Doug