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Spyderco Dragonfly 2 Plain Edge Folding Knife, Yellow [link]
Tons of good options in that price range. How big do you want to go? Some ones off the top of my head
Blur, Skyline, Leek, hell, the Cryo G10 is what, 25-30 bucks?
Ton of good options in a variety of lengths and prices. I can't even begin to encompass their entire lineup. However, I'm going to recommend what's in my pocket right now, the Dragonfly 2. On amazon the Salt with H1 rustproof steel is 45 bucks right now. My friend goes scuba diving with his, the thing will not rust. The standard version in VG-10 steel is right at 50 bucks
I recommend saving another $20 and springing for a Spyderco Dragonfly 2 In H1. Light as a feather, legal nearly everywhere, nigh invulnerable (like The Tick), and easy to sharpen with a great pocket clip! Just gave one as a first knife gift to my sister.