The Neo Ventilator has become an extremely popular (& extremely expensive at $500) Leslie simulator. Now they have just come out w/a smaller, less expensive model called the mini VENT:
http://www.youtube.com/watch?v=sxmSF1QvJsY
They are going for about $350 or thereabouts. I'd like to get one at some point this year. I'm using an actual Leslie model 130 & it's a pain to lug around.