It depends somewhat on where you live. There's very little point for those who are not in the US to get paid in amazon.com vouchers because you can't download digital products and shipping is outrageously expensive.
I'm in the UK and get paid by cheque. The threshold is $100, but you can set it to higher amounts if you want to. Most UK banks accept foreign cheques - mine (Santander) charges £10 per cheque.
The best thing for you to do is to log into your amazon associates account and take a look at the payment options for you.