I've been using Cantu Shea Butter Leave-in...it's $4 for 16oz and sold at walgreens... you only need a little to get the moisture you need, it's very heavy leave-in which is good if you have extra dry hair like me....it has a light cone as the 7th ingredients FYI, but I've found it doesn't buildup at all...

If you want reviews from 4a/4b's there are a ton on NC.com

Cantu Shea Butter Leave In Conditioning Repair Cream - NaturallyCurly.com

Hope this helps
BC ~ August 2010 ~ GOAL ~ hip/tail bone length
Current Length: 12 inches
3b/3c VERY naturally porous hair