Source for 125KHz RFID Chip

RFID
I would like to produce clamshell card in Bangladesh. I have sourced coil winding machine but could not find good source/supplier of rfID chip in CUB or PCV form . Yes I have found some source but their chip cost almost same as clamshell. Is there someone who can give me a good supplier/manufacturer. Harisur RAhman harisurr@hotmail.com