Try craigslist... I sold my light on it.

I'd dig a midsized Koi pond, place a liner, drain, and skimmer, build a waterfall for return and aeration, and then fill the filter with filter gravel and enjoy fish watching. My understanding from the buyers I've done these for is that it's very relaxing interacting with your fish.
This is something you can probably do for less money than it would take to purchase the Koi fish. I've heard they're pricey.
If this has no appeal I'd put it on Craigslist (doubtful because I don't want to deal with the phone calls) or at the end of the driveway (definitely the most likely).

See ya,
Kelly