I have a Gerber caron-steel folder I bought at Wlmart for $20-25. It
keeps an edge reasonably well. I use it most often for cutting paper,
so I keep a pretty fine edge on it that dulls a but quicker than I
would like when cutting anything more substantial. Don't put as fine
an edge on it if you cut a lot of banding.

More importantly to me than how often I have to sharpen is that I can
easily open/close it with one hand.

I don't see it on their web site, but it looks similar to this one,
but without the skeletal handle.

http://www.walmart.com/ip/Gerber-Par...Knife/11071296