[Indonesia] Saleh Bay whale sharks - can you turn up and join a group? The price for one person is very expensive

Hi,

I’d like to go from Bali to Saleh Bay and snorkel with the whale shark but the price for 1 person is quoted at 2,500,000. That’s way too much for me, so I was wondering if it’s normal to turn up and be able to join a group to keep the costs down. 6 people is only 600,000 per person for example!

Thanks