Just checked the SuzukiAus EPC parts lookup from home and can tell you the front cable is NLA, rear is available and should be about $40, head and base gasket NLA, RH crank seal about $17, LH crank seal about $13, centre case gasket NLA, LH case cover gasket NLA, the only "seal" in the gearbox is the primary shaft oil seal and its about $8. A gasket "set" would have to be bought aftermarket as nearly all OEM gaskets are sold piece by piece. These (and nearly everything else) should be able to be sourced aftermarket by any dealer through SERCO Aus for the engine parts and A1 accessories for Motion Pro cables. So yes in a roundabout sorta way your local dealer would be the simplest way to get everything without the hassle. Hope this helps.
Cheers, Brendan