I kept missing when products were in stock and have the “notify when in stock” checked on my UI account, but didn’t get emails when some items were in stock. I assume they didn’t stay in stock long enough. Crosstalk Solutions on YouTube made uinotify.net so you get instant email when items are in stock. Free to use unless you want to customize your selections. This morning the G4 Doorbell Professional was back in stock for a limited time and I was able to finally buy it after waiting a year. And no, I never received an email from UI about its availability.