My hair is also 3a/3b. Check out my signature...everything on there is pretty inexpensive and the giovanni and aubrey organics are organic.
-3A, fine, very thick, normal por., normal elast., long, dye- free (CG since Nov. '11)
-Low poo (As needed): CVS Argan Oil Renewing Shampoo
-RO: GVP The Detangler
-Styling: LALSG
-PT: ION Effective Care (seldom)
*I have learned that sometimes less is more when it comes to my hair*