If you are looking for affordable sound effects packs or royalty-free music tracks, then consider adding rocksuresoundz.com to your short list of web sources for these.
There are currently 28 sound effects packs available covering a variety of different types of sound effects, each pack contains between 80-200 sounds. Packs are $6-95 each.
Also there are now several hundred high quality royalty-free music tracks in a range of genres available at $6-95 per song. This music is licensed for either commercial or noncommercial use.
http://rocksuresoundz.com