Arduino & AC Relay

i looking for [u]ready[/u] DC to AC Relay that can i control AC Relay Switch using DC power from Arduino

can i have URL for any website buy like this relay

http://powerswitchtail.com/default.aspx You control the powerswitch tail just like you control an LED.

There are also relay shields to control more than one relay.

yes i mean by ready just plug and use