Obviously the first port of call is the website of the organization themselves which is
A nice site which used to have a bulletin board for fans that predictably I guess got shut down by the organization....booo!
However it gives a good guide to what is currently available and you can order direct from them which is through their trading arm True Blue Music
Alternatively you can negotiate your way around the variety of internet shops that sell jazz which you should be able to find easy enough or get on an auction site for stuff you really need.
If you want to find a specific title then the organizing forum sites are excellent help for Blue Note addicts
This also gives a good and comprehensive guide to other similar music as does the excellent site run by Alan Lankin Jazzmatazz which has loads of other links and info about what is coming out and when
Let me know if you need any further help