Where can I get a travel adaptor to fit my UK plug and convert it to a USA plug socket?

I have a mobile phone that needs charging, and as I'm really forgetful, I didn't bring a travel plug adaptor with me to the States. Is there anywhere I can buy one for my sony ericsson k700i charger?

The entry socket needs to take a UK type plug and then plug into US wall sockets.

I'm not sure if I need a voltage converter as well?

Any help appreciated, thanks!!

Tesco, asda. Your charger should hanle the voltage ok.

Wal-Mart, Target stores should have them...or check out Home Depots, Menards stores