Are they still making that instrument? What are they worth new or used?
I don't know if they're going to be discontinued, but there are handful of online merchants that still carry them. The SLB200 can be had for around $2100 give or take a couple hundred bucks. I picked mine up new for $2000 through my local Yamaha dealer.
Andy's Music - $2100
Invalid Link Removed - $2376
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Southwest Strings - $2380
I've yet to see a SLB200 turn up on ebay, but have seen the SLB100's go for about $1800 - $2500. I think it'd be safe to say the SLB200's should hold their value relatively well. And the fact that the silent basses are made in Japan (which usually = quality craftsmanship and reliability), should help retain their value for a while.