We have been receiving back orders for certain items in Hyper-SV and in Hyper-ST by Signet Armorlite. The stock room manager where we buy our lenses from tells me from her experience that the back orders may fore-tell a discontinued announcement by the manufacturer. We use these lenses for full field styles for very high plus power orders. There aren't alot of lens choices for these Rxs and it may make doing this type of Rx even more of a challenge.