Here's info on the bumper pads...copied it from another post, so prices I'm sure have changed.
I got mine at Auto Barn and you can also get them at Amazon.com. I also heard you can get them at some of the auto parts stores. They are made by Pacer and here is the part # for them -25535. They also come in silver I believe too.
Just shop around for them to get the best price. I just checked at amazon.com and they have gone up nearly $3.00 a set since I was there last, but they are still less than $10 a set.
Edit...just checked and they are $14.08 a set. Guess they are a pretty hot item, so they keep raising the price. :naughty:
AMAZON link, so you can see what we're looking for.
As for vent visors...I got mine from Advance Auto for about $50...they are the stick on kind. I'm sure the others will chime in and let you know where they got theirs. Several different places to get them depending on what you want. I always find it's best to check ebay first...if they are available, you'll usually get the best deal there.
Can't help on the stereo...I'm still running on stock system.