What's a good value for this boost controller.

Hey Challange Fans, So there is one part on my current build that I don't have a price for. 

It's a simple mechanical boost controller, my brother bought it secondhand for his legacy 2.5 probably around 2004? Its been in the garage ever since. I finally bolted it onto the mionette the other day but I don't know what value to add to the build sheet. What does everyone think is a fair value? 

Anywhere between $0 and $20 

I'm going with $0.00.  I also have one that's been sitting for 20 years bnib.

I'm liking these numbers guys. 

Can I assume a zero dollar addition to use some of this years old oil-based paint? 

I'm not sure about the paint, there is probably a precedence for that.  

What I did want to say is that you need (iirc) 5 agreeing answers from non newbies for fmv.

I'm good with $0.00 for the boost controller. 

Find comparables on FBM or Ebar or I'll go 50% of what you can get the cheapest new one for.  

I found one for $12.99 with free shipping.   

So I'm at $6.49.   

$0 parts from your own stash are what make people doubt the whole challenge.  Put a real value on.  If you can find an actual $0 Manual Boost Controller aquire it, give yours away and run the $Free one.

Also the current equivalent of that MBC is $58 new.  Obviously yours is used but..