You can buy Minecraft from the internet from:
www.minecraft.net/
Or try those free Minecraft codes websites.
Not efficient. Rarely works, usually in England or USA.
7-11 , you can buy it from there, theres usually a hanging place where hangs cards like Google Play $5000 or something else. There is usually Minecraft prepaid cards. To Be Honest, I bought it from there and it is quite expensive. HK$210.