NBA tickets

[bttfiii]

hi guys, i'm visiting san jose in March and am thinking of catching some NBA matches (warriors, suns)

other than online sites (razorgator/ticketsonline), how else can i buy tickets? will the ticket prices drop closer to the match date?

i'm have never watch any nba match live in my life so i'm very excited about this! is it advisable to sit on the upper deck?

any help is appreciated! thank you