No it's not cheaper to buy something than to bring what you already own.
By definition. š¤¦āāļø
And ftr finding a high quality helmet for someone with a large European shaped head isn't remotely easy in se Asia. I have tried for several years before I just started bringing my gear from the states.
If I wanted a poor fitting one with all the protection of a salad bowl then sure, but I like my brains inside my skull.š¤·āāļø
Other people bring their own scuba gear because they depend on it with their life.
Who the heck are you to judge what is appropriate for other people to prioritize?
You should probably think about your yearly income vs that of the shop owner before you begin haggling.
Also if you are like me and prefer to spend your money in local shops rather than lazada, you can still use Lazada to help you understand what something could cost with negotiation.
some people do this crazy thing called budgeting where they have one pile of money reserved for one thing, and yet have a completely different pile of money that they reserve for something else.š¤·