Hello Ozbarganiers,
I am in charge of the travel desk here at Space Hotel, 380 Russell St (between La Trobe and Victoria streets), Melbourne VIC 3000. You can purchase these tickets at our 24 hour hotel reception. We always have tickets with our 24 hour reception staff. But if you want to buy many tickets (for example 10+ tickets) and want to be absolutely sure about the availability of tickets at the reception, you can call our 24 hour number 1800 670 611 (freecall within Australia) to double check with our reception staff.
Sealife Melbourne Aquarium tickets - $22.00 per ticket
We also have few more specials as below if it helps anybody.
Eureka Skydeck tickets - $16.50 per ticket (normally $19.50)
Melbourne Zoo - $28.00 per ticket (normally $30.80)
Unfortunately, we don't have any child/concession/family tickets available. Also, there are no restrictions for these tickets. You can use them on weekdays, weekends, public holidays etc., and are valid at least until October this year.
Happy to answer any queries you may have.
Cheers.
Always thought the aquarium was a total ripoff at full price.