a online phone card seller friend现在只联系到位于BC省的电话卡供应商。有些供应商比较谨慎，不肯直接给PIN,而是给卡。这下就惨了，回到家里还要用硬币刮卡.it is not easy to be a online phonecard seller. Anyone knows whether we should buy as wholesale from card 供应商 or we can buy as retail(Just buy one or 2 PINs one time from card 供应商 and we put all the PIN into our database? If we cannot sell out the phonecard, whether that means all the PIN cannot be returned to 供应商?So the investment is all the money we spend on buying the PINs(Maybe we should buy at least 1000PIN from each 供应商?)How to find a 供应商?