I'm looking for some recommendations on an inexpensive yet functional carbon steel folder with a relatively thin blade, much like an Opinel. However, I want this to be a hot 'n humid knife- one that won't have the wood swelling issues that an Opinel has. So, that means I'm going to need it to have a metal frame, but I can go for adornmants that are synthetic, bone, wood, (whatever works). The other condition that I'm looking to fill is that the knife must either lock (funky methods are okay as long as they are functional/ practical) or have a decent backspring. I want some sense of blade security. I have a friction folder (peasant) and I want to avoide possible swelling issues with wood. I want to keep this affordable ($15 to $25 if possible). I have no problem buying used pieces, so any suggestions are much appreciated.