Rangers at MSG is a great vibe and the place is truely spectacular, highly recommend if you can get there.Stub hub will have tickets day of games cheaply wherever there's a game on but getting 4 tickets together is a risk so best to buy in advance if you have specific games you want to go to.
We got Brooklyn Nets tickets for $6 4 hours before tip off in 2017 for example. Short train ride to their arena if you want to go to a cheaper game
They rave about MSG but ultimately it's just another arena. Unless you do a tour for the history side of it all, I didn't find it any different to the others. You'd get cheap tickets for Pelicans and Magic if the schedule lines up, just keep an eye out while you're there. Knicks tickets were the most expensive, we paid $90USD for 3rd tier seats and they're alot better now
Heaps of people sell tickets outside arenas but I didn't go that route to buy
Try get a seat at the bottom of the 2nd deck, you want to be able to see the ceiling.