I use the Gerber/Fiskars like Ryan suggested.. I keep the small Gerber or Fiskars slider saw in my truck and one in my fanny pack, I also keep a good pair of bypass pruners with the saw..I have cut 8 inch trees with the little saw. The bypass pruners and saw Come in handy when using a climber stand too.
For setting up ladder stands and cutting small shooting lanes I use a Fiskars 12 ft pole saw pruner combo from Walmart or Lowes, as long as you don't let the blade rust they cut fast.. I let the first blade rust up.. I now take the blade off and store it in the truck when not in use. I'll have to take a look at that Gerber exchange a blade, we have a Gander Mountain store here with a bunch of Gerber stuff.