Online/internet trading stock broker firms on the colombo stock exchange in sri lanka with the least initial i?

can someone please give me the name of the brokerage firm that offers the least amount required for opening an online trading or internet trading account on the cse. the one that i currently have wants a minimum investment of rs. 200k which is currently unaffordable to me. furthemore it would be much appreaciated if a list of firms and their requirements are provided.