I have 10x Howitzer Shells total.
The bid is for 1x shell. If you win it, you can buy the remaining shells for half the cost of the first one!
ie: You buy 1 for 1,500 caps, you can buy each one after that for 750 caps.
Starting bid for 1x = 1k
Increments of 500
(http://imageplay.net/img/m7Gbd249461/screen_24_01_2012_21_35_43.jpg) (http://imageplay.net/)