Over my many years of work in these areas I have discovered products and services that I use in my treatment and evaluation. While I use lots of things, I only share things here that I truly believe in and think others would benefit from knowing about...
IVY Pay is a HIPAA compliant payment option for therapists of all kinds. You can get $1000 in payments processed for free by using my code -- eliw439 -- when you sign up.
Amazon is a great way to get materials to support your work with students with learning differences or physical needs.