I don't know how the price compares to Ouidad, but my protein-craving hair loves Spiral Solutions Repairing Protein Treatment as a leave-in. I've also just started playing with CHS Silk Leave-In and really like the results. If your hair isn't quite as much of a protein floozy as mine is, As I Am has a fantastic leave-in that is definitely less expensive than Ouidad.

3a/f/iii
Modified CG since 11/5/11
CLEANSE: CJ Daily Fix, DevaCare No-Poo, CHS Treatment Shampoo
RO: SS Caitlin's Conditioner, CJ Beauticurls Strengthening
LI: SS Repairing Protein Treatment, CHS Silk Leave-In
STYLE: Re:Coil, Curl Keeper, Deva Ultra Defining Gel, Curls Rock Amplifier,Sweet Curls Elixirs Okra Gel and Hard Hold Gel, SS Curl Enhancing Jelly and Firm Hold Gel