WEST MALAYSIA 西马:
1st 500gm RM6,add RM2/500gm onwards
Sabah/Sarawak：
1st 500gm RM8，add RM2/500gm onwards
(500gm=5pair)
e.g.1-5pair---------->rm6
6-10pair--------->rm6+2=8
11-15pair-------->rm6+4=10
16-20pair-------->rm6+6=12
21-25pair-------->rm6+8=14
26-30pair-------->rm6+10=16
31-35pair-------->rm6+12=18
