J.W.
I would politely email the seller one more time and mention the previous email. Ask for a response or item shipped with tracking number within the next 5 business days. Tell them that if you don't receive a response or the item by then you will have no other options but to take action...that could be with Pay Pal, Ebay, Credit Card company (all of the above). You can and should leave negative feedback at the end of that time if nothing is received. Most reputable sellers don't want the negative feedback.