before online shopping make a check list.

1. Credit card (prepaid aswell)
2. Paypal account created using Qatar CC.
3. Shipping method (forwarding agents like Shop n Ship or Easyshop)
4. Reputed seller.

online stores are plenty but shipping is the pain and expensive part. so consolidate your shipment.
I use ebay US, Amazon US and Amazon UK for most of my online shopping.