The lenses that you are talking abt can be bought in Singapore & cheaper too. Considered that you don't have to pay for delivery to Singapore.
The shop is Fotographix at Lucky Chinatown. They sell the following Russsian lenses:
Peleng 8mm (not sure the price)
Zenitar 16mm fisheye (cost S$350 without the lens adaptor)
You have to pay extra to buy the appropriate lens adaptor depending on the camera system that you are using.
Hope you find the info useful.