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http://www.premier1supplies.com/
Whether you buy from Premier 1 or not you should at least get their catalog. It is a great educational tool. They do have good products but you have to judge for yourself whether the price and shipping costs works best for you or not.
I got the barbed wire at the base idea from one of their catalogs. I asked one of their customer service people why that would help and she told me that when a dog/coyote/etc is digging under a fence they will raise their back up to guage their progress and hit the barbs and hopefully back out. This is easier than digging down and burying more woven wire but the buried woven wire is probably more effective. You can always do both if you wish.
http://www.kencove.com/fence/
These guys have several sizes and shapes of the fixed knot fencing, however, for chickens and predator control you want the smaller mesh.
http://www.zarebasystems.com/
You can find loads of additional sources of products and information by just using Google or your favorite search engine and plugging in "electric fencing."
After you decide what brand and type product you want you should check with local sources and compare their prices with what you will pay to order and ship the same thing to you.
DO NOT be suckered in with descriptions that make claims based on the "miles of fence" that can potentially be energized with a particular charger. Distance energized is affected by soil moisture or dryness and the amount of green or dry grass that may be in contact with the hot wires on your fence. Ideally you can spray the ground and kill the weeds. However, Roundup and other similar products can get pretty expensive if you have much pasture fence to deal with. And trying to keep it down with a weed whacker can also be very time consuming if you have very much fence to cover. If you are only trimming or spraying around a coop and run either approach will work well and not be a burden.
The only proper way to compare chargers is in "Joules OUTPUT or RELEASED" not in "Joules STORED."
I know that budget is always a consideration for most of us but personally I suggest getting the best charger you can afford. You want to leave intruders with a memorable impression.