Where is a good place to get a decent diode.
You need to be more specific, there are a few sources of diodes however I think most of us here buy mostly from https://sites.google.com/site/dtrlpf/
DTR sells a 650 nm module.
He is a great seller I have made multiple purchases from him.
Seriously, if you ever need a diode DTR is your man!
Edit: also add 40$ to your budget for some Eagle pair laser glasses if you haven't already!
Unfortunately this is not a cheap hobby, my wallet is sad!