Lovely, lovely, lovely contraption. I'd love an early 3CL to go with my late SFC1000
There's every chance it'll find interesting new ways to frustrate, irritate & bankrupt you but you'll most likely not care
Pretty good spares availability & there's a lot of knowledge n experience in the various Laverda forums & clubs. Most of the common problems are easily sorted & there are any number of upgrades for the period shortcomings (eg better ignition & uprated alternator).
Forgot the ball park figure - in the UK you'd be talking 3000 - 5000 pounds, possibly more depending on condition. If you decide it's not the bike for you then there's always someone (usually an Australian) looking for one.