In my opinion, they can giv more competitive price coz they can buy in big qty... There's few era maju ma, one in desa jaya, one outside pelangi indah, another new one at Johor jaya ros merah... I got mine at the one outside pelangi indah, coz near my house...
Can try SHT n ah meng at pelangi oso, but I always got a feelin their price is expensive after hearing from some frens...