This is 150 Gold idea for Hunter's Potion item Hunter's Potion which grands 1 charge instead of 5 and refills when slaying a monster or visiting the shop to give early game sustain to junglers

I personally rarely find myself buying Hunter's Potion item Hunter's Potion because 400 gold seems kinda too expansive, delaying the finishing of the final tier jungle item which seems like waste of gold and time

My usual start is
Hunter's Machete item Hunter's Machete + 3x Health Potion item Health Potion or
Hunter's Talisman item Hunter's Talisman + 3x Health Potion item Health Potion

Refillable Potion item Refillable Potion gives 250 health
3x Health Potion item Health Potion gives you 450 health
Refillable Potion item Refillable Potion is twice weaker than 3x Health Potion item Health Potion
and both options cost 150 gold.

The reward system that Hunter's Potion item Hunter's Potion provides is pretty damn neat.
150 gold version of Hunter's Potion item Hunter's Potion would give the early sustain that junglers needs. It grands 1 charge only but when a large monster is slain the potion is refilled so the jungler can keep going and when done with farming they will be able to gank a lane with good amount of health and mana.
This potion can solve mana and health issues that Mana users and Tanks may have giving them better early game

500 gold Starting items would be
Hunter's Machete item Hunter's Machete 350 gold + Hunter's Potion item Hunter's Potion 150 gold or
Hunter's Talisman item Hunter's Talisman 350 gold + Hunter's Potion item Hunter's Potion 150 gold

Late Game Scaling is optimal and maybe not necessary but its something that come to my mind so I decided to add it anyways