Well Howdy. I think that a few of our members will say that you picked a great forum to join to first enter the interwebby world of screen printing help and advice and general bull slinging
We have a great showing here of "dischargers", and you have come to the right place for information.
Your reference of hoping to use plastisol as a pigment with discharge to keep costs down is sure to get some action from them!
Once again, welcome!