The general marketing term is always "inserts". I would suggest that any other term is derogatory.
A stamp
A Stamp
stuck upegotisticalCockyconceitedannoyingshow offShow off is often used to describe someone who is always bragging.
Another word for someone being stuck up is 'snob.'
another name is the transaction
Snob
bigoted
Junk mail stuck through the letterbox, Books of all shapes and sizes, Internet served EBooks
You buy another.
find another friend
Stuck up, pretentious.
Second Gear