Get earplugs or earbuds to protect your ears (and possibly for music). Plugphones?
If you need stands (i.e. if your bike doesn't have a centerstand) and chain cleaning stuff, you can get that on Amazon.
You can get supplemental tools for your toolkit and just general emergency stuff (first aid, etc) from Amazon.
If you don't have a battery tender, get one of those.
If you're going to spend a bundle on amazon.com, consider using smile.amazon.com. Part of the $ from your purchase will go to the charity of your choice. Costs you nothing.