In your price range, check out the following:
- Kershaw Scallion
- Kershaw Chive
- Kershaw Leek (blade length is right at 3")
Just slightly above your price range (up to $70):
- Spyderco Dragonfly
- Spyderco Delica
- Spyderco UK Pen Knife
- Spyderco Urban
If you are concerned about startling people who are not accustomed to seeing knives outside of a kitchen, and I presume there are many like this around D.C., then you may also want to look into a more traditional slipjoint or lockback for your EDC. There are many excellent options in this category that fit within your budget.