Penpal

What about the ink for one of these machines? Is there a special brand that needs to be used and is it expensive? Also is the ink expensive and can it be refilled making it cheaper the next time its purchased.

I am new to t-shirt printing and would like to ask a few questions. Can any printer be used for printing T-shirts? Also its sounds like from this thread the design software is the most important aspect of printing t-shirts. Also I was wondering what kind of ink is recommended.