The other day Costco had a three pack of these 300 lumen Duracell tactical flashlights on sale for $15, with batteries included. That was after $4 instant off. I tried a pack, and they are pretty bright. The downside is that they are noticeably bigger than some of the smaller "tactical" flashlights, there is no place for a string type thing to hold it, and it does not have a strobe. But it is bright as hell (about 300 lumen bright, ha), and it seems pretty durable so far. It uses the 4 AAA batteries shown there in the box, and inside it has one of the standard rotary bomb launcher things that holds the 4 batteries in it, just like those cheap tin LED lights have.
Overall, for $5 per light, this seems like a very solid flashlight.