You can get small mooncakes from Eng Bee Tin Deli and premium ones from Shoppers, S&R and even Shangrila Hotel!
The cheapest at Eng Bee Tin is a pack of 4 bite-size pcs for 55 pesos. They also have pack of mini mooncakes for 80 pesos. Not bad di ba!
There is a hopia set specifically for the mooncake dice game, I saw at set today at Diao Eng Chay for 1,550 pesos.