I think Epay hav em for around $20 yeah... Not hard to get...
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http://cgi.ebay.com.au/Punch-Down-KR...d=p3286.c0.m14
$8.76 including shipping.
Depends on the cable type you're using and there are set standards for cable lengths before you get signal loss. Same principle as your older TV cables.
Cables run through walls and ceilings are usually a little different from patch cables and "extension" cables.
Krone is the brand.
Insulation Displacement Connectors (IDC) are the actual connector you are talking about. They are terminated with an IDC tool.
http://images.google.com.au/images?h...-8&sa=N&tab=wi
http://www.chinapans.com/images/idc-...9877601-87.jpg
I also need to let you know that what you are doing (DIY cabling of this sort) without a cabling licence is illegal.
The includes purchasing your own cable and putting the RJ45 ends on, terminating cable in RJ45 inserts in wallplates, or running any cable in a "permanent" method.
"Permanent" even means under the carpet.