SoyaKing or those van vendors are everywhere in most of Klang Valley suburban Township.. U can find them in front of any Banks in those Suburban townships

Well, since u insist, and provided you are in Puchong, The best so far for me is the young couple van operating inside Puteri Mart every weekend.

Otherwise, there are 1 in front of Citibank Bdr Puteri, Public /MaybankBank, Puchong Jaya, There are still lotsa them around.. who say so difficult to find?..Probably the name soya king no more but still the same vans