Add on, if it not highrise, but landed, the different price maybe affected by below few reason
1. Facing EAST SOUTH WEST NORTH have different price
2. Non Facing - Facing to empty place like fencing or taman / recreation park will be more expansive
3. Bumi lot / bumi terbuka / non bumi lot price different
4. Same taman but different phase , phase 1 cheaper but phase 2 expansive a bit. So the cheaper price unit became available during Loan Rejected unit
5. Promotion package changed within hari perayaan
6. etc etc.

Its your right to choose buy form agent or developer staff, but the most important is who give you better service? and sale after service. For your knowledge, agent selling project based on developer package, sale admin staff is not the one control all the promotion and package.