Hi Dave,
The VIC Club has more than 20 cars with the Petronix 1864A units fitted. We have purchased them direct from the US - from a company called carshopinc.
http://www.carshopinc.com/index.php/cPath/21_24_22/page/4They have them listed for US$77.95 + postage at the moment. I bought 2 lots of 10 units over the last 6 months for our Club and got them for US$70 each + total US$60 postage - worked out at $90 Australian each.
The guy I dealt with was called Tim.
In general, they are easy to fit and give good results. We did have one unit fail and I sent it back for warranty, 10 days later a new one arrived back
Worth going to the states for this as even with the dollar a bit lower, the closest you can get here is off Ebay @ $130 + $12 postage. The Australian distributor wants $300
Regards,
Trevor_B