It is Siege prices but everything had been a little slow for a while and prices dropped. I believe Ingots, Wood, Leather and Cloth will get better prices with the new demand.
It is easy, if it sell to fast, prices are to low, if it don't sell, prices are to high.
Check Vendor Search and other Community vendors, when you set your price. Vendor Search may have bart in prices being lower now, in the past, you had to visite a lot vendors to find best price.