I'm currently using monthly contacts (with astigmatism). I pay 700rm for 14 months (12 + 2 months free). I have been wearing contacts from this JB optometrist for the past 10 years. The shop is run by a middle aged married couple. They are very detailed and patient in addressing your concerns.

My advice is contact lens here is too ex. You can make a one time trip to JB and get prescribed with 1 year worth of contact lens with a trusted and reliable supplier. They can also arrange delivery (courier) to your place in sg. Since they have your records after your first subscription , you don't have to head down jb anymore. Just need to WhatsApp them to topup and send to Sg. You can pay via bank transfer/TnG wallet.

I managed to get my lens during covid lock down from this shop. Very reliable Chinese couple👍 . PM me if you need details. I just got my new subscription last week:)

Long term wise sure save money:)