There are hundreds to choose from, in every price range, size, battery type, brightness, and so on.
You can go to Walmart or Target and buy a very decently performing LED light,
Coleman, Energizer, Inova, among others, for around $20-$30
You can order some pretty kickass lights from China for $5-$30 and be quite happy.
Budget and needs determine the best options.
There was a Husky 2-C cell light at Home Depot for about $25 that looked like a rocket...
I bought one and it's a great light that doubles as a club. I don't know if they still carry those.
I have an OLight M20, as well as their Ti AAA light, both are good lights...
But they all suit different purposes. Can't carry a 2C light in the pocket, and a AAA light isn't going to be ideal in the woods.
Rechargeable lithium cells are great, but is that something you want to get into? Or do you want AAs?
If it's AA or 2xAA you want, I'd suggest just shopping around locally.
If you want something really blinding, you'll need to step up to something like 16340 or 18650 rechargeable cells.
Unless you want to pay for CR123s, which I personally don't care to do.