A few match questions from a new guy

Cheers, mostly an MLS and Bundesliga fan but have watched a few Indy games on tv and we wanted to come in and check out a game and cheer with you guys.

A couple questions:

Is there merch sold at the stadium at games?

What decent-but-not-super-spendy food options are in reasonable walking distance?

Anything to recommend food wise at the stadium? (I know its usually expensive but sometimes we do like the vibe)