No they will not buy back stamps
you can buy coupons at the post office that are redeemable in foreign countries for stamps
Its a post office, so anything postal from stamps to envelopes.
The post office, or some tabacchi shops
At Sainsburys etc
Postage stamps. It is the post office.
One book of stamps can cost approximately $10 at the post office. This will include 20 stamps that are personalized. You can buy larger amounts at $.48 per stamp.
Yes the post office sells 10 cent stamps. Stamps are available in a wide variety of denominations and not all offices will have a full selection. You can mix and match as necessary, so if they don't have 10 cent stamps, you could buy two 5 cent stamps.
No, but you could buy some 5 cent stamps and make the current 44 cent rate.
The Post Office is not a charity. They don't work for free. When you buy stamps, you are paying the Post Office for the charges incurred by them for handling and processing your mail.
Stamps in the US can always be used at face value. The post office won't buy them back, they will tell you to use them.
The Post Office often will have artists provide drawings to specific requirements for various stamps. Sometimes contests are held and the winner gets their artwork on a stamp. For some of the state stamps the individual state held the contest.