Join.. nestle baby club, enfamama club, dumex, aptamil, abott.. all these allow you to request for samples. Plus, some have clubs so they’ll follow up with you and give you the stage 3 sample as well when your LO reaches 1yo. Just google all of them:)
Go to the various milk company’s website there’s a page to request for the samples. Alternatively, paediatrician clinic’s also usually have some milk samples too...
I have done up a list on where you can get free samples > https://www.missyqiqi.com/free-sample-for-the-kiasu-parents-and-shoppers/
Go to the Company's website to request for samples.
Online or baby fair
Request online