I pay nothing... but then again I own the company.
Typically you will be looking at 25 to 33 per month for monitoring depending on the company. 25 tends to be the industry standard. Those who charge more typically give the system away for next to nothing and maintain ownership so you cannot switch.
As far as installation goes, as mentioned above, there are some companies who will give the systems away for dirt cheap but what you end up getting is about as good as dirt. The old saying you get what you pay for definately applies in the security alarm industry. For some, monitoring is a numbers game. Throw as many systems in as you can who cares about the quality... hense wireless security systems. Easy to install, failure is rarely noticed (Most people don't test their alarm as often as they should) and if it is the contract is rock solid and removes them from responsibility. Hardwire security systems will always be the better choice. OK, enough of that rant, can you tell I'm not a fan of wireless security systems... If you want to read more details check out http://ezinearticles.com/?Wireless-Security-Systems---The-True-Cost&id=562150
There is also some more info on security systems and non electronic ways to improve the security around your home on my website at http://www.keepsafesystems.ca
http://www.keepsafesystems.ca - KeepSafe Systems installs services and provides alarm monitoring services for security alarm systems in the Vancouver area of the Lower Mainland Fraser Valley British Columbia.
The KeepSafe Systems service area includes but is not limited to North Vancouver, West Vancouver, Richmond, Delta, Tsawassen, Ladner, Surrey, Cloverdale, Abbotsford, Mission, Aldergrove, Maple Ridge, Haney, Port Coquitlam, Coquitlam, Port Moody, Burnaby, New Westminster, Kamloops, Kelowna, Courtney, Comox, Nanaimo, Lions Bay, Squamish and pretty much everywhere in between.