General stores accept the widest variety of merchandise, but they all pay the same prices for the items you sell. There are various items categorized as "Apparel" that are enchanted to decrease shop prices and increase prices for the items you sell, such as the Amulet of Zenithar, the Masque of Clavicus Vile, the Thieves Guild Hood, etc.What is the best place to sell items in Skyrim?
There general stores, the store will have the symbol of a weighing SCALE on it, those are the stores, and if you sell them stuff and they happen to run out of gold?, wait or sleep 2 days(48 hours). They'll restock with gold.
In WHITERUN: fast travel there, as you apear inside the town infront of the doors,then walk all the way straight, untill you see the store on the right(thats the store)
If i confused you this will help also for both WhiteRun and Solitude (or any other city)
http://www.uesp.net/wiki/Skyrim:MerchantsWhat is the best place to sell items in Skyrim?
The Riverwood Trader in Riverwood is probably the best place, Since money there respawns every 24 hours.
trading center in whiterun is up by dragonsreach. And i found that is the best place to get your moneys worth.