I've found that the folding saws you find in the garden center for cutting larger limbs, with a blade about a foot long, work quite well on wood up to 4" diameter or so. About $10 for the low end and $50 for a Silky, which my tree trimmer friend claims is the bees-knees.

They usually also sell a larger bow-type saw that handles wood up to 8" easily. There is a quite nice folding aluminum version that is known as a 'Sven' or 'Swede' saw but they get pricey.

Cheap is okay. You work a little harder for each cut but if you lose it, bend it, back your truck over it, or it gets dulled by sand, you buy another.

A little wax, sold in the hardware store to lubricate bandsaw blades, makes any sawing easier. Makes a world of difference. Old-time sawyers used to wet their blades with turpentine or kerosene. Works almost as well, actually a bit better IMHO, on pine with a lot of pitch.

Cleaning up hiking trails I've found a nice set of leather gloves made a big difference.