Whether you can buy wire connectors at local hardware stores depends on the hardware store. Some hardware stores do carry wire connectors.
Most local hardware stores carry bell wire. The big-box stores probably only carry the DIY wireless kits. A suitable replacement is furnace thermostat wire.
Chicken wire can be bought from a number of stores, particularly hardware stores. Andersons and Ace Hardware have chicken wire in stock. Online, Fabric also has cheap chicken wire for sale.
Connectors
Copper wire can be purchased at many different stores. The type you need will determine where you should purchase. Places like Micheal's, Pat Catans, or Hobby Lobby all carry copper crafting wire. If you need something larger you can purchase thicker lines in a larger quantity at you local hardware or big box hardware store.
Any hardware or home improvement store carries wire racks. They can also provide great instrcutions on how to maintain them. Try your local home improvement store or even search online on thier website to get pricing info as well.
A hot wire foam cutter can be purchased at a local hardware store or a big box store such as Lowe's. One can also find this item at specialty online stores which may be less expensive and easier to find.
It's called a Network Interface Card, or "NIC" for short.
You can find chicken wire at many hardware stores like Canadian tire, Home Depot, Home Hardware, Rona and more. If you want it for the lowest price though, I would check out this link: http://www.alibaba.com/showroom/cheap-chicken-wire.html
Banana connectors are single wire electric connectors that join wires to equipment. The male connector is known as a banana plug and the female connector is a banana jack or banana socket. Banana connectors are available for purchase at audio and electronic stores, as well as at Amazon online.
A well stocked metal work shop should have a wire guage as should your local hardware store
One place a person can try is Amazon. Other options for cheap wire connectors are DasCheap, AliExpress, DHGate, Radio Shack, and APlusSupply. Or one can by second-hand wire connectors from eBay.
Yes RJ12 connectors are used to connect wire to dial up modem