Weekend/ Monthly scuba diving groups

While it is still possible to dive in Singapore waters (and there are supposedly a few corals left), the water is generally very murky due to the amount of ship traffic and other disturbances.
There are diving schools and others organizing regular trips to good diving locations in Malaysia and Indonesia, which you can find by Google. (Sorry, my last such activity was over 15 years ago, so I have no up-to-date infos.)

Many thanks, Beppi for the details.  Agree that the info (15 years+) is quite quite dated!

To add, I'd already searched on Google but they typically provide for rates/ packages targeting tourist/ short term people who may do 1/ 2 dives or avail 1 package.  In my limited diving experience, there's always a differential rates/ packages for domestic ppl (in this case, persons residing in Sg) given the recurring business they generate for the centre.  It's for and from this latter group of people, I'm seeking details/ insights/ inputs!!

Hope it clarifies and provide more context to my original query.

I don't think many tourists book diving trips to other countries in Singapore, when it is possible (and cheaper) to book directly in the destination countries. Furthermore, differential pricing for residents/non-residents is uncommon in Singapore. (What makes you think diving schools here do that?)
You may, however, individually negotiate a price reduction with the school if you book a number of trips at once.