Sim Free Mobile

cheapest on the o2 website – (£50)

https://shop.o2.co.uk/phone/Motorola/W220

cheapest at phones 4 u (£69)

http://www.phones4u.co.uk/shop/shop_payg_details.asp?itemkey=150716&st=215&netkey=11

http://www.phones4u.co.uk/shop/shop_payg_details.asp?itemkey=143732&st=215&netkey=11

Cheapest at The Link (£49)

http://www.thelink.com/martprd/store/lin_page.jsp?BV_SessionID=@@@@1853463974.1166211059@@@@&BV_EngineID=ccdeaddjjeiejkecflgceggdhhmdgmj.0&page=Product&fm=null&sm=null&tm=null&sku=191887&category_oid=-28157

at Tesco (£59)

http://www.tescophones.com/pay-as-you-go/o2/sony-ericsson/j230i/o2pp/

try also the carphone warehouse (it wouldnt load when i just tried)

http://www.tescophones.com/pay-as-you-go/o2/sony-ericsson/j230i/o2pp/

Failing that get a cheap phone, get it unlocked and buy an o2 sim card!

oo and ebay!