While I may have paid more than $25 for them after subtracting S&H I paid right about $25 ea for my SOG Field Pup and Pentagon Elite II. Both have given me YEARS of use, the PEII as my EDC which will be getting yet another well deserved trip back to SOG as soon as my Griptilian shows up.
My other vote would be for the CRKT M16 series. I and many of my friends/acquaintances have have put many years of use and abuse on them. I gave my first one to my little brother who used it as a camper, camp counselor, ski instructor and whitewater raft guide up until it finally got lost in the field. I told him that it was fine, I gave it to him because it's a good knife that will stand up to use but isn't so expensive as to cause a coronary if it breaks or gets lost. I'm far happier that he got the better part of a decades use out of it and lost it than I would be if he kept it safe in his room till the day he died.