Trevor
The starter units aren't cheap.
I found a fellow down here in Victoria off ebay who could supply me just the solenoid unit very cheaply, when I got overkeen tightening up my electrical connections in original build.
I snapped off the contact and was sure I'd have to buy a whole starter. Recall my initial research into those prices was frighteneing but am also pretty sure looking at the same fellow's starter prices by comparison he was a whole lot cheaper.
Fairly sure this ad refers to this same fellow.
http://cgi.ebay.com.au/Brand-New-Sta...item415093ce87
Mind you on ebay the prices are all over the shop. I'm assuming there may be particular features with one starter over another.
Good luck.