Muffin, street value/monetary value means very little on this site. It' all about what you want and what the other person wants. My first trade on this site was adolescent chicken wing feathers for goose feather. Well, of course the goose feathers are better than chicken feathers. But, the guy had never tried chicken feathers and he had a lot of goose feathers.
A trade I'm doing now is a twenty month old seasoned 49" osage stave for a maple board. Street value of each maple board $10, osage stave $30-50. BUT, for the life of me I can't find maple boards around my area. So, I'm extremely happy with this trade. I'm hoping to get a couple backing strips from the maple board. And I'm going to send 2 staves instead of just one.