Prices vary in motion detection cameras, starting around 99 and going up depending on features. eBay and nextag are good websites to research when looking for detection devices.
I have a manual for the EML Model ES100TMQV3 3 Light Motion detector. My unit has stopped working and I have not been able to contact the company. The 866 number in the manual is no longer in service and their web site is 'under construction' - not a good sign! Seems to me that they are out of business.
You can find a good used camera on crags list or on eBay both those websites have really good prices and I am sure you can find a great camera on there.
http://www.grainger.com/ Is a great place to find a multi-gas detector. You can get one if you choose they are a good thing to have, if you feel it is necessary to your home.
The Amazon website is a good place to buy a good spy camera. They have lot's of sellers so you have a large selection to chose from. They have micro and mini spy cameras that are motion activated for as low 20.00.
To find a a good cctv camera system online you should go to www.ebay.com or www.amazon.com. They have great deals on those sites and you can find reviews about them too
Amazon is a good place to start to find a refurbished Nikon camera online and they offer some very good prices for a refurbished Nikon camera online as well
I find the Nikon Coolpix good for film.
Vivatar makes a really good night vision camera. You can find good prices for Vivatar cameras on amazon.
You can find a good precision camera to purchase at your local Best Buy as they offer a selection of high quality products. You can also purchase one online from Amazon.
You can find a good deal on a Sony Cybershot camera by going to websites such as www.Amazon.com, www.newegg.com, www.overstock.com, or by using shopping comparison websites such as www.shopzilla.com.
Kodak is a well known camera. They have cameras that will fit most needs and price ranges. You should be able to find the exact camera you need.
That all matters on opinion. I have that camera, and personally I do not like it. It has pretty good pictures if you take the time and hold still, but a lot of the pictures it takes comes out blurry. I've had it take very clear pictures occasionally, and I'm not sure if it's just me or if the camera's ability to take motion pictures(even the slightest bit of motion) sucks. I wouldn't recommend it if you're planning on using it to take clear and good quality pictures though.