Apple's certified-refurbished desktop Macs sell out in minutes and restock at random — usually overnight. Refurb Radar scans Apple's US refurb store every 60 seconds and emails you within a minute of your Mac coming back, with per-build watches (chip, RAM, storage). It also publishes live measured restock data: restock frequency per lineup, median time to sell out, and the overnight drop window. Free, no account, one-click unsubscribe.