Personally, I use yogurt as the base for my deep conditioner. In fact, I uses it tonite... sometimes I'll mix in fenugreek, an egg, a banana, and/or some oil of choice. Try it plain and experiment with it..
As far as store bought, the organics olive oil pak, or whatever its called worked ok. The only other deep conditioner I've bought is the creme of nature argan oil and had terrible results. I used to think they all worked the same before buying that. My hair did not like that stuff. You could also try the queen helene hot oil treatment. I try to stick with what's cheap or natural rather than spend a ton on tiny bottles.