Pete,
A lot of stock seems to be seasonal. I don't know about this item in particular, but that seems to generally be the case. The good new is that even though it doesn't feel like spring, the stores are starting to change their stock over to the appropriate items.
One of the pains for me of being a nubie is that I don't know what I need until after I really needed it, and by that time it isn't available.
Jim