The Nest Protect Smoke + Carbon Monoxide Detector is returning to stores with a new retail price of $99, down from $130, The New York Times reports. Nest recently halted sales of the alarm after finding a safety feature — Nest Wave — could cause the alarm to have a delayed reaction to fire in some circumstances. Users with installed Nest alarms connected to the Internet had the feature deactivated by Nest, and it will be reactivated remotely once…