This post concerns the pricing aspect of traders. 
Something similar was mentioned in this post:

http://forums.projectego.net/teyrs-little-shopkeeper-modification-primer-dummies-6327/

That post concerns adding items to a shopkeeper and mentions a way to change
the value of the items. Credit goes to Teyr for making most of this list.

I used Teyr's list, then expanded it to include wandering traders and taverns

My post differs in that you change the actual traders percentage of value charged,
rather than the price of individual items. No need to open each item you want to change,
you simply use the trader's list.

Click plus sign beside CShopDef,
Double click the trader # you want,
Click the plus sign beside that traders CShopDef,
Then click EE2FC7F1 CShopDefArray1List,
Change '(float)Type Sale/Wanted' of the item you want to .75 to pay 3/4 price
to .5 to pay 1/2 price. .25 to pay 1/4 price, etc.


9304: The Hero Title Vendor at the WitchWood Arena
9319: The Shopkeep inside the WitchWood Arena
9360: The Tailor at Bowerstone South (The Slums)
9364: The Female Barber at Bowerstone South (The Slums)
9371: The Tavern at Bowerstone South
9392: The Shopkeep at Bowerstone North
9411: The Blacksmith at Bowerstone South (The Slums)
9420: The General Items Shopkeep inside the entrance to Bowerstone South (The Slums)
9438: The Tavern in the Bordello
9446: The Hero Title Vendor Outside the Guild of Heroes
9463: The Tavern in the Guild
9467: The Guild of Heroes Shop (This one may cause problems.)
9499: The Tavern at Hook Coast
9502: The General Items Shopkeep at Hook Coast
9507: The Blacksmith at Hook Coast
9522: The Tavern at Knothole Glade
9535: The General Items Shopkeep at Knothole Glade
9537: The Tattooist at Knothole Glade
9539: The Blacksmith at Knothole Glade
9565: The Tavern at Oakvale
9570: The Blacksmith at Oakvale
9575: The General Items Shopkeep at Oakvale
9609: The Charity Worker at Snowspire Village
9614: The Blacksmith at Snowspire Village
9619: The Tailor at Snowspire Village
9629: The Tavern at Snowspire Village
9630: The General Items Merchant at Snowspire Village
9632: The Tattooist at Snowspire Village

10766: CREATURE_TRADER_STOCKED_01
10767: CREATURE_TRADER_STOCKED_02
10768: CREATURE_TRADER_STOCKED_03
10769: CREATURE_TRADER_STOCKED_04

10770: CREATURE_TRADER_STOCKED_TATTOOIST_01
10771: CREATURE_TRADER_STOCKED_TATTOOIST_02
10772: CREATURE_TRADER_STOCKED_TATTOOIST_03

10773: CREATURE_TRADER_STOCKED_BARBER_01
10774: CREATURE_TRADER_STOCKED_BARBER_02

11391: Darkwood Camp General Items Seller
11392: Darkwood Camp Tailor
11393: Darkwood Camp Armorer
11394: Banditcamp General Item Seller
11395: Banditcamp Armorer
11396: Banditcamp Tailor