Kershaw Rake? Or JYD II? They're roughly $80 - $90 each.
But really if you want a nice flipper for under $100 - under $50 - under $25 - I say check out the Inron MY803.
It's a great knife.
9cr13mov steel, nice G-10, and a nice steel frame lock. Good lock up, centered blade, hair shaving sharp, quick flipper, choice of three colors.
It's just really great for the price.
You can even get them for under $20.
It's a big guy but fits awesome in the pocket, feels great in the hand, etc.
I own knives of very high quality, and this knife has the best quality to price ratio in my opinion.
I was just highly impressed.
Here's my two, now all I need is a Tan one. =]
Closed:
Lock side:
Open:
Partially open:
With my ZT 0560:
Check it out.