I'd say about $5 each in BU condition. Somewhat more for the double-strike. By the way, there is no term "offstruck" or "off struck". The correct term is "off-center strike".
The value is going to be determined by a number of factors... 1. How off-center the strike is. 2. Whether or not the date/mint mark show 3. The rarity of the coin. As GDJMSP, probably the best resource for determining the values is checking them out on eBay as I also am not up to date.