i gave away a lens before...on craigslist...i had a taker within like 15 minutes and 3 or 4 within a half hour.
even though it was ****ty AND gave an ERR99
edit: my dad got 2 lathes once. he ordered 1, they shipped 2...never asked for the other one back nor charged him. sold it to a buddy's uncle for half of what he paid for the first one. i think it was from harbor freight...