Can I buy MRT card in 7 Eleven?

Hello there, I'm curious about something. I was wondering if it's possible to purchase an MRT card from a 7-Eleven store. I know they offer a wide range of services and products, but I'm not sure if MRT cards are among them. It would be really convenient if I could just pick one up on my way to the station. Do you have any insight on this? Thanks in advance for your help!