Uh, that's a jack shaft. Belt drive clutch to chain driven sprocket. You can remove the pulley and use a sprocket in its place. I'd hold on to it. It may prove useful in your current build, or the next one.
no way in he77 it'll cost that much. Maybe $20 tops. Yeah it'll fit flat rate. I might even be able to do a regional rate box to Canada. What is your region code?