Here's a dropbox page for that script I mentioned in Tweets a few days ago. Just wanted to add code comments and a little more user friendliness before putting it out.
Currently it's only set up for looking at stuff I was interested in selling, namely herbs and alchemy items. Adding new items shouldn't be too complicated if anybody has some requests or just feels like doing it themselves.
Basic usage is as follows
ECOM CHECK <comm> [DIR] : Checks market for <comm>, add [DIR] to use at directory
ECOM CHECK ALL [DIR] : Check market for all known items, add [DIR] to use at directory
ECOM SHOW <comm> : Show data for <comm>
ECOM CLEAR : Clear recorded data
ECOM HELP : Shows the above list
So usually I'll go to the plex and check all, then go sit in my storeroom and check the prices for each item and see if I wanna make adjustments.
Have fun.