Note: some of the below links are affiliate links, however, they're products I personally use or believe will be of help to you and cost you absolutely no more. I make a small commission on some of the products if you purchase through the below link.
Mason Bee Supplies
There are many options for getting the live Mason bees (shipped in their larvae stage) most local plant nurseries or farm and garden stores will carry them. Or you can have them shipped to your house. Look for a company that's in your region or will let you pick what region you're in for the right bee.
I've always gotten ours from a local store, but this is an online option (note, this is the brand our local nursery stocks and what I currently have!)
Fertilizing
Fox Farm Tiger Bloom
This thermometer stays in my compost pretty much year round so I can easily monitor the temperature and guage when it needs to be turned or fed.
