3 in 1 combo ticket

Hi,

I read that if you buy our 3-in-1 combo from travel agent it's cheaper (includes entrance to Madame Tussauds Hong Kong, Peak Tram two-way ticket and Sky Terrace 428 ticket) then at the foot hill of victoria peak, is that right ? If yes, can I just walk into any travel agent and buy them straight off the counter ?

I will be staying at TST and spend a lot of time in Mongkok so any travel agent you can suggest that I get my ticket from ?

Thanks

Cheers