There is soooooooo much out there, expect the usual replies. PM2, Manix, Delica, Endura, 0450, 0452, Griptilians and Mini Grips, Osbournes, Steel Will and WE Knives. You're better off giving a few parameters aside from price.
Handle Material Preference? Lock Type Preference? Deployment Preferences? Length Restrictions or Preferences? Otherwise you'll get as many suggestions as you get replies.
My personal pick would be a ZT 801Ti, it's not too big, it's beefy and has a useful and simple blade shape, and I like flippers. It's around your budget limit. Alternatively a Rat 2 D2 or a Steel Will Cutjack D2 if you want to go budget friendly in the opposite direction.