Metadata not saving properly

I'm trying to give an armor stand some metadata with two doubles in - Buy Price and Sell Price.
On the creation of an armor stand (done with a command) I'm doing this to add the metadata
armorStand.setMetadata("Buy", new FixedMetadataValue(ArmorShop.getInstance(), buyPrice+""));

Which works fine, but (in a seperate class) the PlayerClickEvent doesn't seem to get the metadata properly.
When I use buyPrice = Double.parseDouble(armorStand.getMetadata("Buy").toString());
to get the metadata, it returns org.bukkit.metadata.FixedMetadataValue@....
and so it cannot be parsed to a double.
Why isn't this working?

 

@TheMinecraftKnight
MetaData.value() should return the price.

Also, there should be no reason to turn the double to a string. Remove the +"", the toString, and the parser.

 

@Zombie_Striker How would I get MetaData.value()? MetaData isn't a class, and where would I reference the armor stand?
Also, if I remove the double parser, I can't cast List<MetadataValue> to a double

 

@TheMinecraftKnight
That line should be:

And

(The bold is where I made changes) I removed the +"", removed the parser and replaced it with a cast, and then called value()

 

Value isn't a valid method for List<MetadataValue>
Would iteration be necessary?