The Noun Project is a (very) fantastic place to get SVG from. Let us count the ways
- Literally everything in SVG and actually comes that way
- They are the type of images that SVG is best for
- A lot of free-to-use Creative Commons stuff
- A lot of quality inexpensive icons ($2 each or $1 on a plan)
Remember to take a look at what you get in Illustrator and clean stuff up as needed.