There are some problems with the Common Magic Items are priced for Skaven:
There are a number of differences between the pricing of the items in the BRB and the Skaven army book, and it appears that the lowest cost, regardless of source, is being used. This is incorrect: the cost listed in the armybook needs to be used (pg 172).
In the case of the Biting Blade and the War Banner, the Skaven army book cost is lower than the BRB cost, so the correct cost is being used.
The Sword of Striking, Sword of Battle, and Enchanted Shield are undercosted by 15, 5 and 5 points, however.
There are a number of differences between the pricing of the items in the BRB and the Skaven army book, and it appears that the lowest cost, regardless of source, is being used. This is incorrect: the cost listed in the armybook needs to be used (pg 172).
In the case of the Biting Blade and the War Banner, the Skaven army book cost is lower than the BRB cost, so the correct cost is being used.
The Sword of Striking, Sword of Battle, and Enchanted Shield are undercosted by 15, 5 and 5 points, however.