If your looking for a lot of deco items try
https://aroundthesims3.com/objects/function_electronics_audio_01.shtml
Very safe. I second ad blocker with no script for media fire. Simfileshare has never given me any problems and it's dire r to the download. If you find something you like but the site doesn't work anymore I would definitely try the wayback machine. There are also a ton of Sims 3 creators still with active simblr on Tumblr. Tumblr will be rabbitholes for most though as there is so much content floating around. I love MTS, not a big fan of TSR but I will download from creators I've found and trust from Tumblr.
You can always bc run downloads through s3pe or dashboard (I think) just to make sure you arent getting more than you want.