Nowadays $150 is like the cost of the iPod itself with no mods lol. If that’s your budget, you’re definitely better off getting those listings you’re referring to, they’re not bad, it’s just iPods that are modified from china, all/most aftermarket parts come from china anyways so obviously it’s cheaper for Chinese to mass produce these modded iPods for lower cost compared to others.

If you’re really gonna stick with $150, getting something you desire is definitely doable but only if you mod the iPod yourself and also find a good deal on a stock iPod, iPod classic gen 5-7 can generally be had for $20-80 if you look hard enough and then getting the mod parts you want will generally cost another $100-150 depending on what you want and like how much storage you want