i get plastisol transfers from a Canadian company, here is there website.
Venture Graphics Inc.
they silkscreen onto paper in reverse and you apply them to shirts as you need them, which is really awesome if you are going to events and stuff. they are very good quality and are virtually imposible to tell the difference between theirs and a direct screen printer. i got shirts directly printed when i first started and i wasted a ton of money because i had design that didnt sell or was left with sizes and colors that weren't as popular (like i had a lot of mediums left). now with transfers i just print the design on the color and size that the customer wants, when they want it. i whole heartly recommend this method for new startups who are just trying to break into the market.