Waiting for shipping

[mitcoden-0]

What is a typical amount of time to wait before becoming suspicious that the seller really has no interest in sending you the item?
After a few days of trying to negotiate a price, the seller reluctantly lowered their price by a fairly small amount.
It's been 2 days since the offer was accepted and payed for, to me this seems like a fairly long amount of time to have not sent the parcel yet. 
To make things worse I believe they have also blocked me from being able to send them messages, so I can't even ask for a possible ship date, the "due date" that is given just keeps going up day by day.
Ironically, an item in which I believe they only had 1 of, they are now listing a second is available for purchase, kinda seems like they are just waiting for me to refund so they can sell it to someone else.

[*sons_and_daughters*]

The estimated delivery date will be changing each day because you are looking at the current listing. The dates you are seeing are if you bought the item today. If you click on the listing in your purchase history, there should be a link at the top to go to the actual listing you bought, which should show your ETA. 

As for wanting to refund to sell to someone else, seriously, what would be the point? To gain an extra $3? They had a sale from you. Sellers like to make sales. They aren't going to hold off, or force a refund, so they can sell to someone else. That makes zero sense to me as a seller. That someone else may never come along.