For a super strong and cheap PT, there's a thread on the 2s forum called "PT Recipe... As Promised". It's a gelatin based PT, so it uses the same type of protein as the Aphogee 2 step, but can be tailored to meet your individual needs (the thread contains tons of variations). I hate making my own hair stuff, but I love this PT because it's easy to make it weaker or stronger based on what my hair needs.

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Modified CG since 11/5/11
CLEANSE: VO5 Vanilla Mint Tea Clarifying, DevaCare No-Poo, CHS Treatment Shampoo
RO: DevaCare One Condition, SS Caitlin's Conditioner, Mop Top Daily Conditioner
LI: SS Repairing Protein Treatment, CHS Silk Leave-In
STYLE: Re:Coil, Curl Keeper, Deva Ultra Defining Gel, Curls Rock Amplifier and Strong Hold Mousse, Sweet Curls Elixirs Okra Gel and Hard Hold Gel, SS Curl Enhancing Jelly and Firm Hold Gel