You can get a stock S2+ Biscotti with 219c, not with the 219b. Correct me if I am wrong. Still a great deal for under 20 bucks.

If money is tight, get a BLF a6 with Q8 battery bundled for 20$.

Astrolux s43 might also be interesting, multiple 219c leds, short tube and USB charging for around 25$

For AA, the convoy T2 costs around 10-12$ and is a solid bright light with clear reflector, so quite throwy for AA and can be had in 4000k, too.

For a new AAA with nice CRI and under 10$, check out the sofirn c01, there is a thread about it.