did you try sims3.com?
I know from sims2.com you can download stuff for sims 2, and they have a link that'll take you to sims 3 so you should be able to get downloads there :)
Just go to exchange :)
Check the Sims official website. Its so easy to find it on google.
I dont mean the webpage, I mean any place to download the items.
The offical website is sims3.com.