Do I need tickets to visit all the merchandise stalls around the stadium? I’m not bothered about watching a game I just want to buy a lot of Yankee items I’m from the UK & I love the Yankee baseball merchandise

No you don't need a ticket, you can buy merchandise Inside the Stadium, is very expensive outside it's a little cheaper.

No you don't need tickets to visit the merchandise stalls

You can access the main store from the street without a ticket.... there are also a lot of stores around the stadium selling merchandise

Once in the stadium, one can walk around, Yankee stores in NY is also great for shopping

You can walk to any store around the Stadium and you don't need a ticket to do so.

Any of the outside stuff can be accessed without needing to buy a ticket. There was at least one Yankee store and several boots outside the stadium. Also check a few stores out specific to the Yankees in the streets around times square

You dont need a ticket for the stuff outside the stadium. However, if you google Yankees Clubhouse, these are stores in NYC dedicated to Yankees merchandise.