Somewhere between $3,500 and $8,000 depending on a lot of things.
I pulled the trigger and brought the O-360-A3A for $5K including shipping & customs fees: http://cgi.ebay.com/ebaymotors/Lyco...otors_Aviation_Parts_Gear&hash=item2c5e0ecca3
It comes with accessories, logbook, ... Buying from oversea is always risky. Hopefully I won't need to take advantage of PayPal's eBay buyer protection plan.