They have them on the Warner brothers website........
http://www.wbshop.com/category/wbshop_brands/harry+potter/necklaces+hpjewelryneck.do?nType=2
Have only ever seen the Time Turner key chain for sale in the park stores.
The one on the WB website is by Noble Collection, so won't be available in the park as it is a high quality replica. Also available on their site http://www.noblecollection.com/harry-potter and I have seen them in Hamley's in London.
As of February, yes, they do. It is a necklace that comes with a wood display box. I bought one from the shop in Diagon Alley next to the exit from Gringott's. It wasn't cheap, but it's a pretty cool piece.
I've also seen cheaper versions at http://www.hottopic.com/product/har...culture-shop-by-license-harry-potter#start=34.
The one on the WB website is by Noble Collection, so won't be available in the park as it is a high quality replica. Also available on their site http://www.noblecollection.com/harry-potter and I have seen them in Hamley's in London.