i tried ebay but i couldnt find one where can i get one?

Try Craigslist and call around to local junk yards to see if they have any Avalons in their inventory.

If it is the orginal changer that was an option, your local dealer can supply it. The last one I ordered was not that expensive. Just take them the number off the face of the radio (or the number off the changer as the case may be) so they can be sure to get the right one.God Bless!