Quiltgranny...
You can get them at Walmart, ANY big box store back in the camping/sporting goods department. There are upper end ones at sporting goods stores too. I think I paid about $12.00 for my first one...and I got a bigger one the second time and that was closer to $19.00. Don't buy a crazy expensive water proof one. You're not going to be hiking in the rain in it.. or hanging off the side of a cliff in a snow storm.
I love them so much that if I have to go out in the dark to nab an arm load of wood for the wood stove (we live 8 miles out of town and it's PITCH BLACK out here) I put one on. Once you adjust it (which takes a second max) the light is RIGHT where you need it...every time.