I keep all of my MSCs on both an excel spreadsheet and in my notes on my phone. After some time, you will learn which MSCs email you with available shops, which ones you have to check manually and which ones do both. What I also do is keep my favorites/and most active MSC's bookmarked for easy access and check them once or twice daily. I also keep track of when I know what time of the month they will be posting new shops so I can grab them as soon as they post them. Hope this helps!