This is all I could come up with - as to where to purchase the ingredients - i would think a local grocery market.

Make your own mooncakes

Syrup for mooncake

Ingredients: (A)

1200g sugar
lkg water
1 lime - cut into 4 pieces, squeeze in the
juice and put in the skin as well.
3 tbsp maltose

Method:
Put ingredients (A) into a pot and bring to a boil till sugar has dissolved. Lower heat and continue to simmer
till thick and syrupy.

Switch off the fire and add the maltose. Stir well to dissolve. Leave to cool and keep for use as syrup for the
dough (skin).

Mooncake Pastry

Ingredients:

400g golden syrup
1 tsp bicarbonate of soda
1 1/2 tbsp lye water (kan sui)
100ml peanut oil
550g flour

Method:
Pour golden syrup, bicarbonate of soda and oil into a mixing bowl. Add in lye water and mix with a wooden
spoon. Fold in flour gradually and stir to form a firm dough. Let dough rest for five hours.

Lotus Paste Filling (Lin Yoong)

Ingredients:

500g lotus seeds (seong lin)
1 1/2 tbsp lye water (kan sui)
340ml peanut oil
450g sugar
1 tbsp maltose
1 tbsp kao fun (cooked glutinous rice flour)

Method:
Add lye water into lotus seeds, mix well and leave aside for 20 minutes. Pour in boiling water and cover up
for 20-30 minutes. Strain and wash the lotus seeds to remove the skin.

Boil lotus seeds till soft. Put them into a blender with some water and blend into a thick paste.

Heat wok with a quarter portion of oil and a quarter portion of sugar. When sugar turns light brown, put in
blended lotus paste and the remaining sugar. Stir constantly until paste is smooth and thick in consistency.
Add in the rest of the oil gradually. Keep stirring the paste until thick. Lastly, stir in maltose and stir well to
blend.

Sieve in 1 tbsp kao fun for a thicker and firmer consistency in the paste. Leave orernight before use.

Making of Mooncakes

Method:
Divide your dough into even pieces of 40g each. Roll the dough into a ball and flatten out with your hand.

Weigh the lotus seed paste. If you like the yolk of salted eggs, you can insert one in the centre.

Place the filling in the middle of the flat dough and slowly wrap around it. Seal the edges and roll dough
lightly between your palms until the filling is hidden.

Dust mould lightly with flour. Press dough ball into the mooncake mould. Knock the mould against the table
to dislodge the mooncake.

Bake in a preheated oven at 180 degrees C for 10 minutes. Remove and leave to cool for 5 minutes. Brush on
beaten egg glaze. Return to bake for another 10 minutes or till golden.

Egg Glaze

Mix these ingredients together:

1 egg yolk
1/2 tsp water
A pinch of salt