I'm looking to hide out-of-stock options and show only in-stock options in a drop-down list.

Right now I'm trying to use exposed filters in views with the sizes being defined by taxonomy but if a size is out-of-stock the size still shows.

Also I'll be getting in rare sizes that I want to show themselves automatically when in-stock.

Any help or advice I could receive on this would be greatly appreciated.

(I'm not sure if this would be considered a dynamic drop-down or not.)