merch
n. uncountablen. products like clothes or hats that have the name or logo of a famous person, team, or brand on them. People buy it to show they are fans.
n. goods or products associated with a particular brand, sports team, or entertainer, intended for sale to fans. A shortened form of 'merchandise'.
I bought some official merch at the concert.
The team's championship win led to a massive surge in sales for jerseys and other official merch.
While ticket sales provide the initial revenue, many independent artists rely heavily on merch sales to fund their touring expenses and studio time.
Typically functions as an uncountable mass noun; rarely takes a plural form even when referring to multiple types of items.
I bought many merchesI bought a lot of merchMerch is uncountable and does not have a plural form.