Just this morning, Touch ‘n Go restocked the enhanced TNG card with NFC capability on the TNG eWallet app. Well, within hours of the restock, the new card is sold out already. Evidently, many are still eager to get their hands on the NFC-enabled TNG card.
However, we tried our luck at a Petronas station near Jalan Tun Razak, and fortunately enough, the store got the new TNG card in stock! That being said, we were told the card costs RM13 instead of the original RM10 asking price, oddly enough.

Chances are, other Petronas stations could have the new enhanced TNG card in stock as well. In fact, TNG itself listed a number of participating outlets here that are said to carry the new card. It may be worth checking them out if any of the outlets are near your location.
If you want the convenience of getting the enhanced TNG card with NFC through the TNG eWallet app instead, you can register your interest through the app to be notified of any restock. Head to the Apple App Store or Google Play Store to download the TNG eWallet app.