We're going to be running an annual university challenge style quiz and want to get some buzzers that do the same as those on the tv show.
There will be two teams, and a buzzer/set of buzzers for each team. When one team buzzes, it locks out the other team from buzzing for a while. Ideally we want something with an indicator for the audience to see which team has buzzed.
Does anybody know where we could buy such things or more importantly pricing? We found one site but you email them for pricing and get an email back saying please call us instead. I don't really have time to sit on the phone for 30 mins talking about buzzers, i just want a rough idea of a price.

making them isn't really an option, we need ones bought in.
any ideas anyone?