tl;dr - you can buy the Neutrogena TGel Shampoo from either of the following sites Hotally SG - Neutrogena TGel 250ml @ $22.90 and Lazada SG - Neutrogena TGel 250ml @ $26.90
The shampoo is sold and fulfilled by Hotally on both sites and it is actually much cheaper if you buy directly from Hotally. Both sites accept credit cards and PayPal as forms of payment. Lazada additionally accepts COD for this item.
I was using the Neutrogena TGel shampoo before, but when I got here in Singapore I couldn't find it in any shops. This led me to use the Polytar shampoo which was available from Guardian at that time. The Polytar shampoo was also very effective for me. Unfortunately, Guardian has stopped carrying the Polytar shampoo in their inventory.
I was again on the look out for other alternatives. I tried using the Ionil-T shampoo but I had an allergic reaction the first time I used it :( That's when I tried searching again for the Neutrogena TGel shampoo and happily found it online :)
I ordered from Lazada SG last Sunday (09Nov @ 6pm) and I will update again once I received the item. I'm just excited to share where to buy this shampoo :) If you have eczema and sensitive scalp, you can try using this shampoo :)
Thanks HotallySG for bringing the shampoo to SG :)
Update: I just received the shampoo today 12Nov @ 8pm :)