This ad on Craigslist seemed pretty routine, until I got to the "payment" part. I wonder if this is how things are going to be in the not-so-distant future?
http://spacecoast.craigslist.org/msg/543965960.html
Vintage Conn Professional "Ballroom" Trombone. Model 40H. Serial number "271144" which puts it at around 1929. Very fancy engraving on the bell. Slide in slide tuning. Heavy wear on the gold-plated finish but very few dings. 0.500" bore barrel. Comes with Harmony mute. A bargain at $250. One recently sold on EBAY for $495. Willing to accept 1/4 oz gold coin or 16 oz silver coins (American Eagle or Canadian Maple Leaf in BU or MS-65 condition only) OR nine one-ounce silver coins (American Eagle or Canadian Maple Leaf in BU or MS-65 condition as well) For the sake of a firm barter price and to prevent nitpicking, a 1/4 oz gold coin is $250, a 1/10 oz gold coin is $120, and a 1 oz silver coin is $19 if the coins are BU or MS-65 grade (shiny and clean coins).
Willing to accept 1/10 ounce gold coin American Eagle or Canadian Maple Leaf in BU or MS-65 condition only) OR nine one-ounce silver coins (American Eagle or Canadian Maple Leaf in BU or MS-65 condition as well).


