In the state of Michigan, I am limited to a 5-round magazine for deer hunting. I'm just looking for something reliable, I don't need "SHTF/combat ready." At the same time, I only need a few, so I'm not too concerned with cost for a good mag (~$10-20 range).

I'll be hunting with either 5.56 or 300blk.

These Lancers seem pretty solid, and of course Lancer has a good reputation for their full-size magazines.
https://lancer-systems.com/product/l5awm-5-magazine/

Anything else to consider, or should I just buy these?

I'm sure the Lancers are fine.

Another option is using a Magpul 5 rd limiter in a 10rd PMAG: https://magpul.com/minus5roundlimiter-pmaggenm35-56x45-3pack.html?mp_global_color=118

I'm using 1 Pmag with a 5 round limiter and 1 Bushmaster 10 rounder that I modified with a long 10-24 bolt. I screwed the bolt into the base plate to limit capacity to 5. They both work good.

Used 10rd pmags with a 5 round limiter for over a decade with no issues.

I have a dozen or so of the riveted colt 20's.  Anytime I can find em I buy em!! Don't want to fool with the Gestapo(DNR)