my boss is looking for a linked set. How much do they usually go for??

Roughly $1200-$1500 for a working pair in average condition.

If you can get a linked pair for under $1K you've scored a great deal.

That said, if you like the Cruis'n series, go for Cruis'n Exotica
as the tracks are really cool ( Mars landscape, under-water, deserts, Dinosaurs, etc... )

It's usually more expensive, ( $1600-$2000) and harder to find,
but I think it would have longer appeal than USA.

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I have a working USA sitdown (single), but I bought an Exotica board hoping I can make the conversion (...although that will require changes to the wiring harness and controls )

Good luck,

Cheers,
Steph