Connecting iPod clic to my 2005 Toyota Prius?

I am looking for an inexpensive solution to connect my iPod Clic to my 2005 Toyota Prius. The Prius is a Canadian model and does not have the built in Navigation screen that American models seem to have. It has a cete slot which we never use, a 6 CD changer and we live in a busy city with crowded FM airwaves.