I would second getting one of the REFURBISHED machines from Zig. These are N-C machines, the chalk of the industry for years. Your best bet is to also find a used N-C fringe machine and send it to them to refurbish.
Initially you can get away with using roller (conveyor) track and a 1x10x12f board to run a rolled rug past your machine. If you end up doing a lot of work you'll want to invest in the floor space and expense of an air table. Rolling a rug up and re-rolling it four times to do four sides gets old pretty quick.
You can also buy a portable binder that you can roll around the carpet, but they are much less durable and will need a lot of maintenance if you do any volume of work. If you want a portable, get it from N-C or Bond. If you buy one of the cheap ones you'll need three: One to bind with, one to be in the repair shop, and one to be on the way to or from the repair shop at all times.
I would recommend the N-C FTW for fringe application and the N-C TPB for binding. The Millenium is the best portable binder.
http://www.n-ccarpet.com/index.htm
I haven't used Bond machines but know people that are happy with them.
http://bondproducts.com/
Can't recommend National Equipment's carpet school or N-C machine clones but they have other repair room stuff
http://www.nationalequipment.com/default.asp