Have to second/third/etc. the Rat1 suggestions. Great knife for the price. Would be a good knife for twice the price.
Absolutely, I love the Rat 1 and 2. Both really amazing quality knives for right around $30, smooth action, very strong lockup with no play, quality grip materials and fit/finish, blade has a nice consistent factory edge bevel that will shave arm hair. If somebody wants a good-size, all purpose economical folder, one of these should be a serious option.