Get Printed
So you have have made the ultimate t-shirt design you say? And you are not currently the owner of either a screen printing kit or a heat press? So what do you do? You could run on over to CafePress or Spredshirt with your work, but is that really what you want to do?
How about having a look at some of the submission based t-shirt venues out there? This business models is spreading like the black plague, and it is really a good idea. Sites like Threadless get their designs for a mere $750 + $250 out of their stock (of which they probably earn back two thirds). They also get to print only the designs their users like ending up with products more likely to succeed. The customers are more happy even, getting the stuff they like. and last but not least the designers get to offload their ideas withouth having to invest time money or extra effort.
Above are some alternatives to whom you may send your designs for review. These are off the top of my head. Please leave more in the comment field if you know of any (note: your comment might be delayed if it contains many links).
There is also the possibility of submitting your work to other venues as well. Everyone loves to get suggestions, and if your shit is as good as you think it might get printed.