Well Hallos the first thing to do is ask college! If you are a practising therapist, then you should be able to set up a trade account with their supplier.
I use www.purpleflame.co.uk (no connection - just a satsfied customer), but the clinic where I work have gone with Dermalogica, who have an excellent reputation. Now I wish I'd done the Dermalogica training at college when I had the chance!