Viva is sold at all Maxis Centre (don't have for iP4 yet), as well as all Switch outlets. You got to go hunt them.

There's also a shop in Gurney Plaza (same floor as all those Hand Phone shops IIRC). I cannot recall the shop's name but its situated at the middle part where the place is connecting Old Wind and New Wing together. The shop sells a lot of accessories for smartphone, PDAs, Samsung OLED phones etc. There's a number of iP4 Viva cases there....try ur luck there!

thanks bro
I will try hunting by today