Hello Lena, and welcome to the forum. You stated you have been shopping for about six years, so I'm not sure we can offer you any ideas with which you're not already familiar. Following are ideas for new shoppers, which may not be useful to you.
There is a free version of JobSlinger that works perfectly well. Primarily, JobSlinger represents MSPs using the Sassie platform. It's a site that lets you search for who has shops in your area. Then, if you're not signed with them, do so.
MSJobBoard.com does similar for MSPs using ShopMetrics.
And Prophet MSPs have their similar - archondev.com Theirs is a site most beneficial for blanket sign-ups, as opposed to individual.
With experience, I have found little use for the above. I have my favorites, and have tracked their history of shop release dates. While shops on these sites have most likely been assigned for the month, you will be ready to grab them next month. If you wait for available shops to be emailed, they most likely have already been nabbed.
Good luck. Keep us posted?