Hey man,
I don't know if you can get them, but deezer do a deal with three mobile in the UK. Order a three simcard, put in the mobile number on the deezer website, receive and sms from then and enter the pin the give you back in the site... then you get 6 months for free.
I do this all the time. It's free to get the sim card
or like £1 on eBay.