If you have all your emails from the seller/trader committing to at a minimum the rockers and there is no proof of shipment or your receipt-I would take him to your local small claims court-its cheap to file (used to be about $25) and they handle claims under $1000 usually.
Not likely he will defend-but email him letting him know you are taking him to small claims and suggest that he engage local legal counsel to represent him.
If the deal went down as you said, you have written committments and thus proof and he did not fulfill his end of the agreement (contract), I would expect judgement to go in your favor-either as a direct ruling or due to his failure to defend.
Request a garnishment of wages from the Court and get your recovery that way.
No gaurantees but definitely worth a shot and by the way maybe the way you will ultimately recover what you are out, is through the amount of aggravation you cause Jake Hammond.
Time is money and the more time he has to invest in dealing with you the more it will cost him in time that he cant apply elsewhere like to his job or business.
You will thus collect one way or another; either is cash or in satisfaction.
later, Scorp