The ones on CL you would need a medical license to buy...
But Generally clubs will sell clones for $6-$12 depending on rariety.
If your non-licensed I have heard of people paying all the way up too $100 for one clone of proven genetics.
The real problem is how do you really know What strain your getting?
Trainwreck IMO is a common name, the guy for all you know grew some bagseed and called it trainwreck.
You wont really know till you flower, and even then its truly hard to know for sure.
I would try to get him down to $20 for it.