We sent one to ourselves November 11th and received it this week! Hang in there.

As mentioned below you need to visit the main post office . There is normally a long queue for these stamps to be made so get your personalised stamp made from a photo downloaded from your mobile , pay Rs.500 ( for a whole sheet of 10 stamps) and then collect your stamps at the same counter .

Local currency of Bhutan is Ngultrum. And yes, INR in the denominations of 100 is widely accepted. Our ATMs also work .

You give them your picture, they will create that stamp for you at the office. They also provide a background for you to take picture in case you don't have your own. I don'r remember the price, you can ask them directly.

Not yet but they are working on this. As of now, every Dzongkhag post office has a store from where you can order and have it delivered to your doorstep.

That is a question you will have to ask at the Thimphu post office. Their postal service is excellent and they sell a lot of postcards. There are a lot of connections each day but remember that it is not direct to the USA, it has to go via another country. It will not be quick but yes it will reach its destination.

Postcards to any international destination are 30 Nu.