I recently bought myself a 12-string bass to see how I get along with the sound and, really, although it sounds amazing I'm never going to get to play it.
Here's a link to the eBay auction:
http://www.ebay.co.uk/itm/160701186769
Everything about this bass works perfectly, and the condition is very good for a used bass. The strings are OK, but I'd replace them if I was keeping it.
Happy to let it got for what it cost me (£140) with postage on top, unless you'd like to come and pick it up from me in London in which case no postage to pay!
A cheap way to see how much fun 12 strings are!