My wife asked me for some thing under 100 bucks so I will post the list I came up with for her! I am usually the guy that buys everything I need so I never have anything I want, but this year I thought a little harder
Hang em high Deboned game bags
Backpack/fishing digital scale ( because I am becoming more and more weight concious of my pack and what goes in it)
Work sharp guided field sharpener
Go-hunt Rifle protective gun cover
Zipper pull thermometer (to see how cold it really is when I am out and about)
Z-line Dyneema reflective cord 1.2MM Z line (to replace paracord)
Hydrapak collapsible water bottle
More Duluth Trading underwear!
Wyoming Saw
That was what was on my list
A couple other things you could do for 100 or less
Membership to Go hunt
Membership to Onx Maps
Membership for Corey Jacobsens elk 101
Sawyer water filter
I would suggest you to buy him a nice hunting knife. You can get a quality knife in this budget. Take a look at amazon or swordsswords for various options.
Gators! where mine all the time......keeps pants and boots dry!
a good headlamp
good gloves
extra release (if going bowhunting).....trust me, learned this one hard way!!!!
quality socks