If you have friends or relatives abroad, just ask them to buy a soprano for you specifying the brand and model you like. You choice is very limited here. Yupangco which is the local distributor of Yamaha has a YSS 475 model which sells for about 98K. ROS has a P. Mauriat soprano whose price is about 110k. Your last option would be JB Music which carries a Chinese made soprano which they sell for about 16k.
I got an LC curved soprano from Taiwan for about 74K including shipping cost and taxes. I think in Hong Kong, Tom Lee Music sells a Jupiter soprano for about 30k.