Search for plastisol transfers, there are a couple of really good threads with different companies in them.
I've used Ace, Silver Mountain and Howard and would recommend any of them.
If you can sub them out for the same money, you'll still be paying for that press with less work.
I did an almost-400 shirt (double sided) order for a kids camp a couple of months ago. I did it in 2 phases but it was a lot of work. Well worth it though!
Good luck whichever way you decide to go - (but don't do the vinyl!)
Diane