Check Sportsmansguide.com or Cheaperthandirt.com. They have some decent laser bore sighters for around 30-40 bucks. I have one of the least expensive Laserlyte devices and it works great. It has saved me hours and lots of ammo.
I use the bushnell laser bore sighting tool. I comes with a laser and a bunch of different arbors for different bores. It was only ~$25 and works really well. The laser is a little dim, but not bad. If you are using it at high-noon in direct sunlight, you may have to put your target in a box.
I chose that instead of the cartridge style laser because I can use it for many different calibers and cartridges. I shoot a lot of .30cal stuff and with the cartridge laser, I would have to buy a different piece for each: .308, 30-06, 30-30, 300WinMag, etc, etc.
I use the Laserlyte brand and like it a lot !!! It's inexpensive to boot. If you need an arbor for a 45 or 50 caliber muzzleloader you can just poke a hole in the center of a sabot for the desired caliber. It works great and saves firing a lot of expensive sabot bullets. You can also sight in open-sited rifles and handguns as well. HD1
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