I've been there a few times. It's not hugely expensive although at this point I'd think they have "variable pricing" (based on day and opponent) like most other MLB teams. I'm not sure if they've gone to "dynamic pricing" where the price may change depending on demand. Looks like they haven't yet.
https://www.mlb.com/angels/tickets/pricing
You might consider what time to go too. For night games it gets a little strange. I've been to one night game there but that wasn't terribly odd. I used to watch some games (I'm an A's fan) on TV where it got to a certain time and smoke from the
Disneyland fireworks show could come blowing right into the ballpark.