This is widely available here under the name Tragacanth Gum. Pretty expensive in local terms though, at ¥176 per 100g ($24.22 / 100g USD). Those with local Chinese markets or stores might find it there under any of these names 黃蓍膠;膠黃;龍須膠. My favourite is the last; it literally means 'Dragon's Beard Gum'.
I've never used the stuff, so can't comment on its efficacy.