I've been getting a lot of questions about when the Sentry Controller and Sentry Shield will be back in stock. My best estimate is January 30th. However, due to the Chinese New Year at the end of the month, this batch might be delayed for additional time. If I hear from the manufacturer, I will post an update here.
If you do want a controller or shield as soon as they are back in stock, I recommend you place a backorder - it's looking like the backorder lists might fill up before the batch even gets here.