Payment :- Australian by bank cheque/postal order, electronic transfer or Paypal. I prefer to avoid personal cheques, buyers will have wait for the cheque to be cleared before a parcel is dispatched, this can take up to 7 business days. 
Elsewhere, International Bank Draft or Paypal (preferred). I do not take cheques, money orders or postal orders in any currency other than Australian Dollars.

I always combine postage for mutiple wins.