Pay close attention to the veterans of your association. Also, seek out members that have been to one of the schools. Their insight can be very helpful.
Some of the suppliers:
Gerry Davis Sports (one of the best suppliers in my book)
Honig's (very good 2nd choice)
+POS (be careful with this one, reputation is going down the tubes)
Go the these sites for latest equipment and uniforms.
Then go to Ebay and see if you can do better as far as prices. Don't skimp on safety! If you are just doing LL then a lower priced chest protector is okay. If you are doing 90' diamond, use a hard shell! Buy a mask or a HSM (Hockey Style Mask) as you choose. Don't listen to the posting here or on other sites. It's your choice (no, I don't wear a HSM).
Other that that, keep reading but don't be afraid to post. Use your common sense and above all,
grow a thick skin!
Regards,
Ozzy