First of all, you probably don't want to manually refresh the Steam page to check if the SD is back in stock, so I recommend installing a website monitoring extension. There are a few out there but I can vouch for distill.io because it has a free tier with unlimited local checks. Set the intervals as low as you want, but keep in mind that the last restock lasted about 45 minutes - 1 hour. I personally set mine to... Source: 10 months ago

Recently found out about website change trackers and had to share, like distill.io and fetchnotifs (not affiliated btw). I use them like everyday for amazon items and general stuff. Source: 11 months ago

You can also try notify-me.rs . It's super simple tracker, and has more checks than distill.io , we have bunch of people from this subreddit using it already! Source: 12 months ago

Were these even advertised anywhere online? Insane how fast the 6x8s went. Glad I've had a distill.io alert set there for like 2 years now haha. Source: 12 months ago

Distill.io offers every 5 seconds but it seems I need an upgraded account to be able to select this interval using the Device "Cloud-Distill's Severs (this device)". So it seems I'd need to always be on my computer in order for it to run. So I selected "Any Local Device (beta)" for device. Description for "Device" = Select device that this monitor runs on. Other devices will appear in the list once all devices... Source: about 1 year ago

Https://mitchell1.com/ this is a very popular software for exactly your need. Source: almost 3 years ago

Lots of programs out there but I like Mitchell 1 Https://mitchell1.com. Source: about 3 years ago