Heh, sorry..
Bazaar (Luclin expansion) find NPC who sells it (couple of plat), these are what hold the goods. Park character on wooden platform (just do any search and use the find button on the /bazaar command and stand with them)
Bring up /trader and highlight item to sell, click on coin value, type in amount then hit the "set price" button.
Rinse and repeat till all sale goods done. Then click begin!!
NB.
With Dragons of Norrath there is another feature. Only just got that so can't be much help as not used yet. Basically I believe it allows you to trade or buy stuff as well!