If you're looking for the SIM card, you'll need to order that online. It is not sold in stores, and the shipping would take 3-5 days.
Ordering online from outside the US does not work. I tried, and this is the response I got:
"Dear Customer:
Thank you for choosing StraightTalk Wireless, Inc for your prepaid cell phone and accessory needs.
At this time, we regret to inform you that your order, placed on 03-03-2012, was not approved since the order needs to be made within the USA.
Additionally, you may see a pre-authorization for the corresponding order amount on your bank account activity; the displayed pending transaction should be removed and the corresponding funds should be back on your account within 24 to 72 business hours, depending on your bank.
Thank you for choosing StraightTalk Wireless, Inc for your prepaid cell phone and accessory needs. I hope that you enjoy the rest of your day!
Sincerely,
M Rodriguez | Loss Prevention & Credit Card Fraud | TracFone Wireless, Inc. "
So I guess you'll have to ask one of your US friends to place the order.
What is this with data plans/iPhone plans in the US? Almost impossible as a visitor?