I buy my volvo parts from a local dealer. You can get them online too at:
http://www.volvopentastore.com/ However, Volvo makes some items "Dealer only" to help keep their dealers happy.
Many engine parts are available at NAPA (and are cheaper). I bought my starter there. Boats have some unique components, but there are a lot of similar or same parts over various brands. I have a Mercury transom trim tilt switch as the Volvo one would require some re-wiring and the Merc one was plug and play.
I have purchased some parts from iBoats
http://www.iboats.com/ and as you read through the threads there are a number of other places.
West Marine (has stores and online (sign up for their reward program and you will get catalogs and emails of deals)
http://www.westmarine.com/webapp/wcs/st ... 1_10001_-1Another catalog and online store is Overton's
http://www.overtons.com/
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2010 Sea Hunt Triton 220 "Big Whiskey"2003 FW Freedom 180 Volvo Penta 4.3GL/SX-M "It'll Do Four Now" (Sold)
2012 Avalanche LTZ 4X4 